Bad Catalytic Converter Symptoms: Warning Signs and Repair Options

If your check engine light is on, your vehicle struggles to accelerate, or you notice an unusual exhaust smell, a failing catalytic converter could be responsible. Your catalytic converter is an important part of your vehicle's exhaust and emissions control system, helping reduce harmful pollutants before they leave the tailpipe. When it becomes clogged, damaged, or inefficient, it can affect engine performance, fuel efficiency, and emissions.

Recognizing bad catalytic converter symptoms early can help Cleveland drivers identify potential exhaust system problems before they lead to more expensive repairs. However, catalytic converter problems can resemble issues involving oxygen sensors, ignition components, fuel injectors, and other engine systems. 

At Detroit Auto Clinic, we provide professional engine diagnostics, exhaust system inspections, and automotive repair services to help drivers throughout Cleveland and Northeast Ohio identify the source of vehicle performance problems.

What Are the Symptoms of a Bad Catalytic Converter?

The most common bad catalytic converter symptoms include an illuminated check engine light, reduced acceleration, loss of engine power, unusual exhaust odors, rattling noises, and failed emissions testing. In some cases, a severely restricted catalytic converter can also cause overheating or difficulty starting the engine.

Common warning signs include:

• Check engine light illuminating
• Diagnostic trouble code P0420 or P0430
• Sluggish acceleration
• Reduced engine power
• Poor fuel efficiency
• Rotten egg or sulfur-like exhaust smell
• Rattling noises beneath the vehicle
• Failed emissions testing
• Excessive heat around the exhaust system
• Engine hesitation or stalling
• Difficulty starting in severe cases
• Unusual exhaust smoke or emissions

Not every symptom confirms catalytic converter failure. Problems involving the oxygen sensors, spark plugs, ignition coils, fuel injectors, exhaust leaks, and air-fuel mixture can produce similar warning signs.

A professional diagnostic inspection can help determine whether the catalytic converter is failing or another engine component is responsible.

What Does a Catalytic Converter Do?

A catalytic converter is an emissions control component located in your vehicle's exhaust system. It uses a catalyst, typically containing precious metals such as platinum, palladium, and rhodium, to promote chemical reactions that reduce harmful exhaust pollutants.

On most modern gasoline-powered vehicles, the catalytic converter helps convert:

• Carbon monoxide into carbon dioxide
• Unburned hydrocarbons into carbon dioxide and water
• Nitrogen oxides into nitrogen and oxygen

These reactions help reduce the amount of harmful pollutants released through the exhaust system.

The U.S. Environmental Protection Agency explains how vehicle emissions inspection and maintenance programs help identify vehicles that may need emissions-related repairs.

The catalytic converter works alongside the engine management system, oxygen sensors, fuel delivery components, and other emissions control equipment.

A properly functioning catalytic converter helps support:

• Reduced harmful exhaust emissions
• Compliance with applicable emissions standards
• Proper exhaust system operation
• Reliable vehicle performance
• Efficient emissions control
• Proper operation of onboard diagnostic monitoring

Catalytic converters are designed to last for many years, but contamination, overheating, physical damage, and underlying engine problems can shorten their service life.

10 Common Bad Catalytic Converter Symptoms to Watch For

1. Check Engine Light Illuminating

An illuminated check engine light is one of the most common signs of a potential catalytic converter problem.

Modern vehicles use oxygen sensors and onboard diagnostic systems to monitor emissions-related performance. If the engine control module detects that catalytic converter efficiency has fallen below an expected threshold, it may illuminate the check engine light.

Common catalytic converter-related diagnostic trouble codes include:

• P0420: Catalyst System Efficiency Below Threshold, Bank 1
• P0430: Catalyst System Efficiency Below Threshold, Bank 2

These codes indicate that the system has detected an emissions performance concern, but they do not automatically confirm that the catalytic converter needs replacement.

Other possible causes include:

• Exhaust leaks
• Faulty oxygen sensors
• Fuel mixture problems
• Engine misfires
• Worn spark plugs
• Fuel injector problems
• Air intake or sensor issues

Replacing a catalytic converter without diagnosing the underlying cause may result in unnecessary expenses or repeated failures.

At Detroit Auto Clinic, professional engine diagnostics can help determine what triggered the warning light before repairs are recommended.

2. Sluggish Acceleration

A damaged or restricted catalytic converter can make your vehicle feel sluggish when accelerating.

Exhaust gases must flow through the catalytic converter and the rest of the exhaust system. If the converter becomes severely clogged or its internal structure collapses, exhaust backpressure can increase and interfere with engine operation.

You may notice:

• Slow acceleration from a stop
• Reduced responsiveness when pressing the gas pedal
• Difficulty gaining speed
• Hesitation during acceleration
• Reduced performance when driving uphill
• Engine struggling under heavier loads

These symptoms may become more noticeable when merging onto highways or accelerating in traffic.

However, poor acceleration can also result from ignition problems, fuel delivery issues, restricted air intake, or transmission concerns.

A technician can evaluate engine performance and exhaust restrictions to determine whether the catalytic converter is responsible.

3. Reduced Engine Power

A severely restricted catalytic converter may prevent exhaust gases from leaving the engine efficiently.

When exhaust flow is restricted, the engine may struggle to operate normally, especially at higher speeds or under increased load.

Possible symptoms include:

• Vehicle feeling unusually weak
• Difficulty maintaining highway speed
• Engine struggling during acceleration
• Reduced power when climbing hills
• Engine hesitation under load
• Performance worsening as the vehicle warms up

In some cases, a significant exhaust restriction can cause the engine to stall or make the vehicle difficult to drive.

Reduced engine power can also be caused by fuel system problems, sensor failures, ignition issues, or protective engine management modes.

Because these conditions can produce similar symptoms, professional testing is important before replacing exhaust components.

4. Rotten Egg or Sulfur-Like Exhaust Smell

An unusual sulfur or rotten egg smell from the exhaust may indicate a problem involving catalytic converter operation or the engine's air-fuel mixture.

Fuel contains small amounts of sulfur compounds. During normal operation, the emissions system helps process exhaust gases and reduce certain odors.

When combustion or catalytic converter operation is abnormal, sulfur-containing compounds may become more noticeable.

You may notice:

• Rotten egg smell near the exhaust
• Unusual exhaust odor after acceleration
• Strong odor while idling
• Smell becoming more noticeable as the vehicle warms up
• Check engine light appearing alongside the odor

A sulfur smell does not automatically mean the catalytic converter has failed.

An overly rich fuel mixture, misfires, or other engine management problems may contribute to the odor and can also damage the converter over time.

If you notice persistent exhaust odors, have the vehicle inspected. Exhaust fumes should never be ignored, particularly if they are entering the passenger compartment.

5. Rattling Noises Underneath the Vehicle

A rattling noise from beneath your vehicle may indicate internal catalytic converter damage.

Inside many catalytic converters is a ceramic or metallic honeycomb structure that supports the catalyst material.

If this structure becomes cracked, broken, or loose, pieces may rattle inside the converter housing.

Possible warning signs include:

• Metallic rattling beneath the vehicle
• Noise when starting the engine
• Rattling during acceleration
• Noise becoming more noticeable when the exhaust vibrates
• Unusual sounds near the catalytic converter

However, rattling can also come from loose heat shields, damaged exhaust hangers, or other exhaust system components.

Cleveland's potholes, road salt, and winter driving conditions can contribute to corrosion and damage involving exhaust hardware.

A technician can inspect the converter, heat shields, and surrounding exhaust components to identify the source of the noise.

Detroit Auto Clinic's exhaust and muffler services include inspecting catalytic converters, exhaust pipes, heat shields, and other components for damage or wear.

6. Poor Fuel Efficiency

A catalytic converter problem may be associated with reduced fuel efficiency, particularly when exhaust restrictions or underlying engine problems affect normal operation.

For example, a severely clogged converter can interfere with engine performance, while a rich fuel mixture may increase fuel consumption and contribute to catalytic converter damage.

You may notice:

• Reduced miles per gallon
• More frequent fuel stops
• Poor acceleration alongside increased fuel use
• Check engine light
• Unusual exhaust odors
• Engine running roughly

However, a catalytic converter that has simply lost emissions efficiency does not necessarily cause poor fuel economy.

Reduced gas mileage can also result from tire pressure, driving conditions, fuel system problems, ignition issues, and other factors.

Poor fuel efficiency alone is not enough to diagnose a failing catalytic converter.

7. Failed Emissions Testing

A catalytic converter that no longer reduces exhaust pollutants effectively may contribute to an emissions inspection failure.

Ohio's E-Check program applies to qualifying vehicles registered in certain Northeast Ohio counties, including Cuyahoga County, subject to current program requirements and exemptions.

Depending on the vehicle and inspection method, emissions-related diagnostic trouble codes or an illuminated malfunction indicator light may cause the vehicle to fail inspection.

Potential contributing problems include:

• Catalytic converter efficiency below the expected threshold
• Oxygen sensor problems
• Engine misfires
• Fuel mixture issues
• Exhaust leaks
• Other emissions control system faults

A failed emissions test does not automatically mean the catalytic converter needs replacement.

Professional diagnostics can help identify the cause and determine which repairs are necessary.

8. Excessive Heat Around the Exhaust System

Catalytic converters normally operate at high temperatures because chemical reactions occur inside them.

However, abnormal engine operation or a severely restricted converter can cause excessive heat.

Potential warning signs include:

• Unusually strong heat beneath the vehicle
• Burning odors near the exhaust
• Engine performance problems
• Check engine light
• Visible signs of exhaust component overheating
• Discoloration or damage to nearby components

Engine misfires and overly rich fuel mixtures can send unburned fuel into the exhaust system, where it may overheat the catalytic converter.

This can damage the internal catalyst material and nearby components.

Important: Do not touch or attempt to inspect a hot catalytic converter or exhaust pipe. Exhaust components can cause serious burns, even after the engine has been turned off.

If you notice a burning smell, smoke, or signs of extreme overheating, stop driving safely and arrange for professional inspection.

9. Engine Hesitation or Stalling

A severely clogged catalytic converter may create enough exhaust restriction to interfere with engine operation.

This can cause hesitation, unstable performance, or stalling in certain situations.

Possible symptoms include:

• Engine hesitating during acceleration
• Loss of power under load
• Engine struggling at higher RPM
• Vehicle stalling after warming up
• Reduced throttle response
• Difficulty maintaining consistent engine performance

These symptoms can also indicate problems with fuel pressure, ignition components, sensors, or other engine systems.

A diagnostic inspection can help determine whether exhaust restriction is contributing to the problem.

Other engine problems can produce similar warning signs. Learn more about why your car idles rough or stalls at stops and the common causes behind these symptoms.

10. Difficulty Starting the Engine

In severe cases, a heavily restricted catalytic converter may make an engine difficult to start or keep running.

If exhaust gases cannot exit efficiently, engine operation may be affected.

You may notice:

• Engine cranking but struggling to start
• Engine starting and then stalling
• Severe loss of power before a no-start condition
• Unusual exhaust restriction symptoms
• Engine performance deteriorating as temperatures rise

However, most starting problems are caused by other issues, including weak batteries, starter failures, ignition problems, or fuel delivery concerns.

Difficulty starting alone is not a reliable sign of catalytic converter failure.

A technician should rule out more common starting and engine performance problems before focusing on the exhaust system.

What Causes a Catalytic Converter to Go Bad?

Catalytic converters can fail because of age, contamination, overheating, physical damage, or underlying engine problems.

Common causes include:

Engine Misfires

When fuel does not burn properly inside the engine, unburned fuel may enter the exhaust system.

That fuel can burn inside the catalytic converter, producing excessive heat and potentially damaging the catalyst material.

Rich Air-Fuel Mixture

An engine receiving too much fuel relative to the available air can increase emissions and place additional stress on the catalytic converter.

Possible causes include faulty sensors, fuel injector problems, or other fuel management issues.

Oil Burning

If an engine burns excessive oil, oil-derived contaminants can coat or damage the catalyst material and reduce converter efficiency.

Coolant Entering the Combustion Chamber

Internal engine problems, including certain head gasket failures, may allow coolant to enter the combustion chamber.

Coolant-related contaminants can damage the catalytic converter and interfere with emissions control.

Physical Damage

Road debris, impacts, or damage to the exhaust system can crack the converter housing or damage its internal structure.

Exhaust Leaks

Exhaust leaks near the catalytic converter or oxygen sensors can affect diagnostic readings and contribute to emissions-related trouble codes.

An exhaust leak does not necessarily mean the converter itself has failed.

Age and Internal Deterioration

Over time, the catalytic converter's internal materials may lose effectiveness because of thermal stress, contamination, and normal operating conditions.

However, many catalytic converters last well beyond 100,000 miles when the engine is operating properly.

Can You Drive With a Bad Catalytic Converter?

Whether it is safe to drive with a suspected catalytic converter problem depends on the symptoms and the underlying cause.

A vehicle with a catalyst efficiency code may continue to operate normally, but the problem should still be diagnosed.

A severely restricted or overheating catalytic converter is more concerning because it may affect engine performance and create excessive exhaust temperatures.

When You Should Schedule an Inspection

Have your vehicle inspected if you notice:

• Check engine light with a catalyst-related code
• Reduced fuel efficiency
• Mild acceleration problems
• Rattling near the exhaust
• Unusual exhaust odors
• Failed emissions inspection

When You Should Stop Driving

Safely stop driving and arrange assistance if:

• The check engine light is flashing
• The engine is severely misfiring
• The vehicle loses significant power
• Smoke or strong burning odors develop
• The engine repeatedly stalls
• The exhaust system appears to be overheating

A flashing check engine light may indicate a severe misfire capable of damaging the catalytic converter.

If exhaust fumes are entering the cabin, stop driving safely, get to fresh air, and have the vehicle inspected before using it again.

Continuing to drive with severe engine or exhaust problems can increase repair costs and create additional safety concerns.

How Do Mechanics Diagnose a Bad Catalytic Converter?

Diagnosing a catalytic converter problem requires more than reading a trouble code.

At Detroit Auto Clinic, our technicians can evaluate engine performance and emissions-related faults to determine whether the catalytic converter is failing or another component needs attention.

Step 1: Scan for Diagnostic Trouble Codes

A technician may use a diagnostic scan tool to retrieve stored and pending trouble codes.

Codes such as P0420 or P0430 can help identify emissions-related concerns.

However, these codes are starting points for diagnosis rather than proof that the catalytic converter needs replacement.

Step 2: Inspect the Exhaust System

The technician may examine:

• Catalytic converter housing
• Exhaust pipes and connections
• Exhaust manifold
• Oxygen sensor locations
• Heat shields
• Exhaust hangers
• Signs of leaks or physical damage

Exhaust leaks can affect sensor readings and may need to be repaired before converter efficiency can be evaluated accurately.

Step 3: Evaluate Oxygen Sensor Data

Modern vehicles commonly use oxygen sensors or air-fuel ratio sensors to help manage combustion and monitor emissions performance.

A technician may review live sensor data and fuel trim information to identify abnormal readings.

Sensor behavior must be interpreted according to the vehicle's design and manufacturer procedures.

Step 4: Check for Engine Performance Problems

Because engine problems can damage catalytic converters, the technician may investigate:

• Engine misfires
• Spark plug or ignition coil problems
• Fuel injector issues
• Incorrect air-fuel mixture
• Fuel pressure concerns
• Oil consumption
• Coolant contamination
• Intake or exhaust leaks

Correcting these problems is important before replacing a damaged converter.

Step 5: Test for Exhaust Restrictions

If the vehicle has severe power loss or suspected exhaust blockage, the technician may perform appropriate exhaust backpressure or related restriction testing.

The testing method depends on the vehicle and manufacturer recommendations.

Step 6: Confirm the Repair Recommendation

Once the underlying cause is identified, the technician can determine whether the catalytic converter requires replacement or whether another repair will resolve the problem.

The goal is to avoid unnecessary parts replacement and address conditions that could damage a new converter.

Can a Bad Oxygen Sensor Cause a Catalytic Converter Code?

Yes. A faulty oxygen sensor or related sensor circuit problem can contribute to diagnostic readings that resemble catalytic converter inefficiency.

Oxygen sensors help the engine control module monitor exhaust conditions and, depending on their location, evaluate catalyst performance.

If a sensor is malfunctioning, the system may receive inaccurate information.

However, oxygen sensor problems are not the only alternative explanation for P0420 or P0430.

Other possible causes include:

• Exhaust leaks
• Fuel mixture problems
• Engine misfires
• Aging catalytic converter material
• Sensor wiring problems
• Fuel delivery issues

Replacing an oxygen sensor without testing it may not correct the underlying problem.

Likewise, replacing the catalytic converter without investigating sensor data and engine performance can lead to unnecessary repairs.

Professional diagnostics help determine which component actually needs attention.

How Much Does Catalytic Converter Replacement Cost?

Catalytic converter replacement costs vary significantly depending on the vehicle, converter design, labor requirements, and applicable emissions specifications.

Some vehicles have relatively accessible catalytic converters, while others use converters integrated into exhaust manifolds or more complex exhaust assemblies.

Factors affecting replacement costs include:

• Vehicle make and model
• Number of catalytic converters
• Converter location
• Original equipment or compliant aftermarket part requirements
• Labor and accessibility
• Exhaust component condition
• Oxygen sensor condition
• Corroded bolts or exhaust connections
• Additional engine repairs
• Diagnostic testing requirements

Catalytic converters contain precious metals, which contribute to their replacement cost.

A replacement converter must also meet applicable federal and state emissions requirements for the specific vehicle.

Because engine misfires, fuel mixture problems, and other faults can damage a new converter, identifying and correcting the original cause is an important part of the repair process.

An accurate estimate requires diagnosing the problem and identifying the appropriate replacement part.

Can a Catalytic Converter Be Cleaned Instead of Replaced?

Catalytic converter cleaning products are sometimes advertised as alternatives to replacement, but their effectiveness depends on the actual problem.

A cleaning additive cannot reliably repair:

• A melted catalyst structure
• A physically broken honeycomb
• Severe internal blockage
• A cracked converter housing
• Catalyst material that has permanently deteriorated
• Damage caused by repeated overheating

In some cases, correcting an underlying engine problem may improve emissions performance if the converter has not suffered permanent damage.

However, a catalytic converter that is physically damaged or no longer meets required emissions performance may need replacement.

Professional diagnosis is more reliable than assuming a fuel additive will solve a catalyst-related trouble code.

How Long Does a Catalytic Converter Last?

Catalytic converters are designed for long-term operation, and many remain functional for well over 100,000 miles.

There is no universal mileage at which every catalytic converter must be replaced.

Lifespan depends on factors such as:

• Engine maintenance
• Fuel mixture control
• Ignition system condition
• Oil consumption
• Coolant contamination
• Exhaust system condition
• Driving habits
• Vehicle design
• Exposure to physical damage
• Previous engine performance problems

A properly operating engine can help protect the catalytic converter from excessive heat and contamination.

However, even a well-maintained converter can eventually lose efficiency.

Rather than replacing the converter based solely on mileage, drivers should investigate emissions-related trouble codes and performance symptoms.

How to Help Prevent Catalytic Converter Problems

Not every catalytic converter failure can be prevented, but maintaining your engine and exhaust system can reduce the risk of premature damage.

Helpful maintenance practices include:

• Address check engine lights promptly
• Repair engine misfires as soon as possible
• Replace spark plugs according to manufacturer recommendations
• Investigate faulty ignition coils
• Maintain the fuel injection system
• Repair exhaust leaks
• Address excessive oil consumption
• Investigate coolant loss or internal engine leaks
• Use the manufacturer-recommended fuel
• Avoid driving with severe engine performance problems
• Inspect damaged or corroded exhaust components
• Follow manufacturer-recommended maintenance intervals

For Cleveland drivers, potholes, winter road salt, freezing temperatures, and stop-and-go traffic can contribute to wear involving exhaust components and engine systems.

Road salt can accelerate corrosion of exhaust pipes, heat shields, and connections, while potholes and road debris may damage components beneath the vehicle.

Keeping the engine operating properly and addressing exhaust system damage early can help protect catalytic converter performance.

Frequently Asked Questions About Bad Catalytic Converter Symptoms

What Are the First Signs of a Bad Catalytic Converter?

Early bad catalytic converter symptoms may include an illuminated check engine light, diagnostic codes such as P0420 or P0430, unusual exhaust odors, rattling noises, or reduced engine performance. However, these symptoms can also indicate oxygen sensor problems, exhaust leaks, or other engine issues. Diagnostic testing is needed to confirm the cause.

Can a Bad Catalytic Converter Cause Loss of Power?

Yes. A severely clogged catalytic converter can restrict exhaust flow and reduce engine power, particularly during acceleration or when driving uphill. However, loss of power can also result from fuel system, ignition, or sensor problems.

What Does a Bad Catalytic Converter Sound Like?

A damaged catalytic converter may produce a metallic rattling sound if its internal honeycomb structure breaks apart. However, loose heat shields, exhaust hangers, and other components can cause similar noises.

Can a Bad Catalytic Converter Cause a Check Engine Light?

Yes. The engine control module may illuminate the check engine light if it detects catalyst efficiency below the expected threshold. Codes P0420 and P0430 are commonly associated with catalyst efficiency problems, but they do not automatically confirm that the converter needs replacement.

Does a Bad Catalytic Converter Smell Like Rotten Eggs?

It can. A sulfur or rotten egg smell may occur when exhaust chemistry or catalytic converter operation is abnormal. Rich fuel mixtures and other engine problems can also contribute to this odor, so inspection is recommended.

Can a Bad Catalytic Converter Cause Poor Gas Mileage?

A severely restricted converter may contribute to inefficient engine operation, but poor gas mileage is not a reliable symptom by itself. Underlying engine problems that damage catalytic converters can also increase fuel consumption.

Can a Bad Catalytic Converter Cause Engine Misfires?

A severely restricted catalytic converter can contribute to abnormal engine operation and may sometimes produce symptoms resembling misfires. However, ignition and fuel system misfires are more commonly causes of catalytic converter damage rather than results of converter failure.

What Does Code P0420 Mean?

P0420 generally means Catalyst System Efficiency Below Threshold for Bank 1. It indicates that the onboard diagnostic system has detected a potential catalyst efficiency problem. Exhaust leaks, oxygen sensor issues, fuel mixture problems, and engine misfires should be evaluated before replacing the converter.

What Does Code P0430 Mean?

P0430 generally indicates Catalyst System Efficiency Below Threshold for Bank 2. This code applies to vehicles with a second monitored engine bank and does not automatically confirm that the catalytic converter is defective.

Can a Bad Oxygen Sensor Make It Seem Like the Catalytic Converter Is Failing?

Yes. Faulty oxygen sensors, sensor wiring, or related engine management problems can produce readings associated with catalyst efficiency faults. A technician can evaluate sensor operation and related engine data to identify the actual problem.

Can I Drive With a Bad Catalytic Converter?

A vehicle with a catalyst efficiency code may remain drivable if it is operating normally, but it should be diagnosed. If the engine is severely misfiring, losing significant power, producing smoke, or overheating the exhaust system, stop driving safely and arrange assistance.

Can You Clean a Catalytic Converter Without Replacing It?

Cleaning additives cannot repair a melted, broken, or severely damaged catalytic converter. Correcting an underlying engine problem may improve emissions performance in some situations, but a physically damaged or ineffective converter may require replacement.

How Much Does It Cost to Replace a Catalytic Converter?

Replacement costs depend on the vehicle, converter design, number of converters, labor requirements, and whether other repairs are needed. A professional diagnosis can determine whether replacement is necessary and identify the correct emissions-compliant part.

Can a Bad Catalytic Converter Cause a Car to Stall?

Yes. A severely restricted catalytic converter can interfere with exhaust flow and may cause hesitation, reduced power, or stalling. However, stalling has many possible causes, including fuel delivery, ignition, and sensor problems.

Will a Bad Catalytic Converter Fail Ohio E-Check?

A catalytic converter or related emissions system problem may cause a qualifying vehicle to fail Ohio E-Check if it triggers relevant diagnostic faults or otherwise prevents the vehicle from meeting inspection requirements. A failed inspection should be diagnosed before parts are replaced.

Bad Catalytic Converter Symptoms? Schedule Engine Diagnostics in Cleveland

Bad catalytic converter symptoms can range from an illuminated check engine light and unusual exhaust odors to sluggish acceleration, rattling noises, and significant engine performance problems. Although a failing catalytic converter may be responsible, oxygen sensors, exhaust leaks, ignition issues, and fuel system problems can produce similar warning signs.

At Detroit Auto Clinic, our technicians provide engine diagnostics, exhaust system inspections, check engine light testing, and automotive repair services for drivers throughout Cleveland, Lakewood, Parma, Brooklyn, Rocky River, Fairview Park, North Olmsted, and surrounding Northeast Ohio communities.

We focus on identifying the actual cause of the problem, explaining your repair options, and recommending the services your vehicle needs without unnecessary upsells.

If your check engine light is on, your vehicle is losing power, or you notice unusual exhaust noises or odors, don't ignore the warning signs.

Call Detroit Auto Clinic at (216) 965-4717 or contact our Cleveland auto repair shop to schedule professional diagnostics and determine whether your catalytic converter or another engine component needs attention.

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