Is a Catalytic Converter Covered Under Warranty?

Catalytic converter warranty coverage

The federally mandated emissions warranty that comes with your vehicle covers your catalytic converter against failed emissions tests during its first eight years or 80,000 miles (whichever comes first).

Once this warranty expires, though, any other warranty coverage you may have will only cover the mechanical problems that cause your catalytic converter to fail — not the catalytic converter itself. For example, an engine problem that fouls your catalytic converter could still be covered under your powertrain warranty, even if your catalytic converter isn’t.

If your catalytic converter fails after eight years or 80,000 miles, you are responsible for fixing it — but other warranties might help with the cause.

Catalytic converter warranty exclusions

It’s worth pointing out that warranties only cover failures due to factory defects. That means your warranty won’t cover stolen or removed converters. If you want protection from this unforeseen expense, you will need to have comprehensive auto insurance.

Other common exclusions include:

• Physical damage from accidents, road debris or bottoming out your vehicle
• Normal wear and tear beyond the warranty period (eight years/80,000 miles for federal coverage)
• Preexisting conditions from previous owners if not discovered during the warranty transfer period
• Consequential damages, such as damage to other vehicle components caused by a failed catalytic converter

What voids your catalytic converter warranty

Several specific actions can void your catalytic converter warranty:

• Modifications to exhaust or emissions systems, including removing, tampering with or bypassing the catalytic converter
• Installing noncompliant parts, such as aftermarket converters that aren't CARB-approved (in California) or EPA-compliant
• Failure to maintain your vehicle according to the manufacturer's recommended service schedule, particularly skipping oil changes or ignoring check engine lights
• Using improper fuel types or octane ratings below manufacturer specifications
• Unauthorized installation by noncertified shops or failing to provide proper documentation of the original installation

» MORE: What voids a car warranty?

Does an extended warranty cover your catalytic converter?

Most extended auto warranty companies don’t cover catalytic converter repairs or replacements, but like your factory warranties, they may cover issues that caused your converter to fail.

Always check the fine print and ask your representative which plan includes these issues so you don’t have to pay more out-of-pocket expenses if you ever have to replace your catalytic converter for a manufacturer failure.

“A couple of months into buying the car..even after having it professionally inspected, the catalytic converter went haywire,” wrote Beverly, a reviewer from Michigan. “I thought my policy would cover it...Wish I would have known more about what it did and did not cover when the car dealer sold it to me, would not have bought it.”

How to file a warranty claim for your catalytic converter

Filing a federal emissions warranty claim for your catalytic converter follows these steps:

1. Verify warranty eligibility: Confirm your vehicle is within the eight-year/80,000-mile federal warranty period and has failed an approved emissions test.
2. Gather required documentation: Collect your vehicle's warranty paperwork, proof of ownership and maintenance records to demonstrate proper care.
3. Take your vehicle to an authorized dealer: For federal emissions warranty claims, you must take your vehicle to a facility authorized by the vehicle manufacturer to give them the opportunity to diagnose and repair the issue.
4. Allow diagnosis and inspection: The authorized facility will inspect your catalytic converter and diagnose whether the failure is covered under warranty terms.
5. Complete the repair at no cost: If approved, the manufacturer covers the replacement or repair costs under the federal emissions warranty.
6. Keep all documentation: Save service records and receipts from the repair for your records.

Eligibility requirements for warranty claims

To qualify for federal emissions warranty coverage on your catalytic converter, you must meet these requirements:

• Within warranty period: Your vehicle must be within eight years or 80,000 miles for catalytic converter coverage, whichever comes first.
• Failed emissions test: Your vehicle must have failed an approved emissions test administered by a certified testing facility.
• Proper maintenance: The vehicle must be maintained according to manufacturer specifications, though proof of maintenance is not required if an emission control component is found defective in materials or workmanship.
• Manufacturing defect: The failure must be due to a defect in materials or workmanship, not from damage, misuse or lack of maintenance.
• No disqualifying modifications: The vehicle's emissions system must not have been tampered with or modified in ways that void warranty coverage.

How much does it cost to fix your catalytic converter?

Several factors affect the cost of fixing your catalytic converter, including your car’s make and model and what kind of fix you need:

• A complete replacement can range from around $1,000 to over $4,000, based on our research.
• Fixing your existing catalytic converter can theoretically cost less, but it’s not always a viable option. (It’s not possible in some cases, and even if it is, it may not save you money versus getting a replacement.)

Factors that affect the cost to fix your catalytic converter

The total expense of fixing or replacing a catalytic converter depends on several key elements:

• Vehicle make and model: Luxury or foreign cars often require more expensive parts or specialized labor.
• Extent of damage: Whether the converter is fully clogged, melted or only slightly degraded can influence repair vs. replacement options.
• Labor rates: Regional labor costs can significantly affect your total bill.
• Part availability: OEM vs. aftermarket parts vary in price and availability, with OEM parts generally costing more.
• Additional damage: Related component failures, like a faulty oxygen sensor or engine misfire, can add to the overall repair bill.

» MORE: Cost to replace a catalytic converter

Symptoms of a failing catalytic converter

A failing catalytic converter can lead to a number of noticeable symptoms in your vehicle's performance and emissions. Common signs include:

• Reduced engine performance, including sluggish acceleration and difficulty maintaining speed
• A rotten egg smell caused by sulfur buildup
• Check engine light illumination
• Decreased fuel efficiency
• Dark exhaust smoke or excessive heat under the vehicle

Factors that can shorten a catalytic converter's life include engine misfires, oil leaks, use of low-quality fuel or improper fuel additives, frequent short trips that prevent the converter from reaching optimal operating temperature, and physical damage from bottoming out the vehicle.

Regular engine maintenance — including timely oil changes, spark plug replacements and addressing check engine lights promptly — can help maximize your catalytic converter's lifespan.