How Much It Costs to Fix a Catalytic Converter in 2025

Expect to pay roughly $900 to $2,800 to replace a catalytic converter on most gasoline cars in 2025, including parts and labor. Prices are higher for luxury models, trucks with multiple converters, hybrids, and vehicles in states that require CARB-certified parts; those jobs often land between $1,500 and $4,500 or more. Attempts to “repair” or clean a failing converter rarely solve the issue long term—replacement is the standard fix. Below is a detailed breakdown of what drives the cost, when replacement is mandatory, and how to keep your bill in check.

Typical Price Ranges

Replacement cost varies widely by vehicle, emissions rules in your state, and whether you choose OEM or aftermarket parts. Here are realistic ranges seen by shops nationwide.

• Most gasoline sedans and crossovers (non-CARB states): $900–$2,000
• Mid-size SUVs and light trucks: $1,200–$2,800
• Luxury/performance models: $1,500–$4,500
• Hybrids (e.g., Toyota Prius): $1,200–$2,500 with CARB-compliant aftermarket; $2,500–$4,000 OEM
• Vehicles with multiple converters or manifold-integrated cats: $2,000–$6,000+
• Diesel systems that include DPF/SCR components: $2,000–$7,000+ depending on configuration

These figures include parts and labor and reflect typical U.S. shop rates and parts pricing as of 2025.

Line-Item Cost Breakdown

The final invoice is the sum of the converter itself plus associated hardware, sensors, and labor. Here’s how it usually breaks down.

• Catalytic converter part:
  

  • Aftermarket universal: $200–$600 (not legal for all vehicles/regions)
  • Aftermarket direct-fit: $300–$1,200 ($800–$1,800 for CARB-certified units)
  • OEM (dealer): $800–$2,500+ per converter (some models exceed $3,500)

• Oxygen sensors (if damaged or aged): $80–$250 each; many vehicles have 2–4
• Gaskets, clamps, hangers, hardware: $25–$150
• Labor: 1–3 hours typical; 3–6+ hours on rusted or integrated systems. At $100–$200/hr, expect $150–$1,000+ for labor depending on complexity
• Diagnostics: $100–$180 for scan and inspection (often credited if you proceed with repair)

Vehicles with manifold-integrated converters, severe corrosion, or seized fasteners need more labor and hardware, pushing costs higher.

What “Fix” Actually Means

There’s no reliable internal “repair” for a melted or chemically poisoned catalyst. While some shops offer cleaning services or fuel additives, these rarely restore a failing converter to spec if the core substrate is damaged. In practice, the fix is replacement. It’s also illegal in the U.S. to remove, hollow out, or install a used converter.

Key Factors That Change the Price

Several variables can swing your estimate up or down. Understanding these helps you choose the right part and shop for your situation.

• Emissions rules: States that require CARB-compliant converters (including California and New York, and, for many model years, Colorado and Maine) mandate certified parts that cost more than federal/EPA-only units.
• Vehicle design: Manifold-integrated cats and systems with multiple converters increase both parts and labor.
• Make/model: Hybrids and some Hondas, Toyotas, Subarus, BMWs, and Mercedes often carry higher parts prices.
• Condition of exhaust: Rusted flanges, studs, or pipes add labor; welding or pipe sections may be needed.
• Root cause: Misfires, oil burning, or coolant leaks can kill a new converter—fix these first to avoid repeat failures.
• Local labor rates: Urban and coastal markets tend to be higher ($150–$200/hr) than rural areas ($100–$140/hr).

Confirming these factors with your shop up front helps prevent surprise add-ons mid-job.

Diagnosing a Bad Catalytic Converter

Before replacing, reputable shops verify the converter is the culprit rather than an upstream issue like a misfire or a faulty O2 sensor.

1. Scan for codes: Common codes include P0420/P0430 (catalyst efficiency) and may be accompanied by misfire or fuel-trim codes.
2. Check live data: Upstream/downstream O2 sensor patterns and fuel trims indicate catalyst performance.
3. Backpressure or temperature tests: Confirms clogging versus efficiency loss.
4. Inspect for exhaust leaks: Leaks can trigger false catalyst codes.
5. Address root causes: Fix misfires, oil consumption, or coolant intrusion before installing a new converter.

Good diagnostics cost a bit up front but can save hundreds by preventing unnecessary parts replacement.

Theft-Related Replacement

Catalytic converter theft remains a problem in many regions due to the value of precious metals (platinum, palladium, rhodium). Theft replacements have a few unique cost considerations.

• Replacement converter and pipe repair: $900–$2,800 for many vehicles; hybrids and CARB states typically cost more.
• Additional parts: O2 sensor harnesses or wiring may need repair if cut.
• Anti-theft shield: $150–$600 installed; a worthwhile add-on for targeted models.
• Insurance: Comprehensive coverage often pays minus deductible; confirm whether your policy covers OEM vs aftermarket.

If you’ve been a victim, ask the shop to photograph damage and parts for your insurance claim and consider adding a shield to reduce future risk.

Warranty and Insurance

Some or all of the cost may be covered depending on your situation and vehicle age.

• Emissions warranty: Federally, the catalytic converter is covered for 8 years/80,000 miles on new cars. Certain vehicles under California emissions rules may have longer coverage on specific components.
• Extended warranties: Many exclude emissions items or require specific diagnostics—check your contract.
• Insurance: Comprehensive typically covers theft or road damage, not wear or contamination.

Verify eligibility with your VIN and mileage before authorizing repairs—you might pay little or nothing if still within emissions warranty.

Time in the Shop and Driveability

Most catalytic converter jobs take 1–4 hours once parts are on hand; rusted or integrated systems can take most of a day. Driving long with a failing or clogged converter can overheat the exhaust, harm the engine, and leave you stranded; if the car runs poorly or smells like sulfur/rotten eggs, minimize driving until inspected.

How to Save Money Without Breaking the Rules

There are safe, legal ways to reduce the final bill.

• Use a quality direct-fit aftermarket converter if allowed; insist on CARB-certified units where required.
• Fix underlying causes (misfires, leaks) first to protect the new converter.
• Replace aged downstream O2 sensors during the job to avoid rework.
• Get 2–3 quotes; ask for out-the-door pricing that includes hardware and taxes.
• Avoid used or “test pipe” solutions—illegal and risky.

Balancing part quality with compliance typically offers the best long-term value and avoids inspection failures.

When Cleaning Might Help

If the converter is merely contaminated by temporary fuel or oil issues and not melted or physically damaged, some improvements can occur after fixing the root cause and driving several heat cycles. Chemical cleaners or on-car “flushes” cost $20–$200 but are hit-or-miss and rarely restore a converter that has set efficiency codes for long. Treat them as a last-ditch attempt, not a plan.

Bottom Line

Budget $900–$2,800 for a typical catalytic converter replacement in 2025, with luxury, hybrid, multi-cat, or CARB-compliant jobs often running $1,500–$4,500+. True “repairs” are uncommon; replacement is the reliable fix once the unit is damaged. Verify warranty coverage, correct the root cause, choose compliant parts, and get a detailed, written estimate to avoid surprises.

Summary

Most catalytic converter fixes mean replacement, not restoration. In 2025, common jobs run around $900–$2,800, but hybrids, luxury models, and CARB-state vehicles can climb to $1,500–$4,500 or more. Parts choice (OEM vs aftermarket), emissions regulations, and vehicle design drive the price. Confirm the diagnosis, address underlying engine issues, check emissions warranty or insurance coverage, and use compliant parts to protect your investment and pass inspection.

Can I drive my car with a damaged catalytic converter?

Yes, you can typically drive with a bad catalytic converter, but it’s not recommended due to risks of poor engine performance, lower fuel efficiency, failing emissions tests, and potential damage to other engine parts, including the engine itself if the converter becomes severely clogged. Driving with a bad converter is a temporary solution, and you should get it repaired or replaced as soon as possible to avoid more serious problems. 
Risks and Symptoms

• Diminished performance: You may experience a significant loss of power, especially during acceleration or when going uphill. 
• Poor fuel economy: A bad converter can lead to decreased gas mileage. 
• Check engine light: A faulty converter will often trigger the check engine light. 
• Unpleasant odors: You might notice a rotten egg or sulfur smell from the exhaust. 
• Engine damage: In severe cases, a clogged converter can cause back pressure, leading to engine misfires, overheating, and potential damage to engine seals, rings, or bearings. 
• Emissions failure: The vehicle will not be able to meet emissions standards and will fail an inspection. 

When to stop driving
If you notice any of the following symptoms, you should have your vehicle towed to a mechanic: 

• A complete inability to start or stay running
• Severe overheating coming from under the vehicle
• Frequent stalls or bogging down when accelerating

Is it worth replacing your catalytic converter?

Yes, it is worth replacing a faulty catalytic converter because it is a critical component that removes toxic emissions, and driving without one can cause your engine to fail, reduce fuel efficiency, and lead to failed emissions tests and potential legal issues. While costly, the replacement prevents more extensive engine damage, ensures your vehicle is environmentally compliant, and allows it to pass mandatory smog checks. 
Reasons to Replace a Bad Catalytic Converter

• Environmental Compliance: A functioning catalytic converter is essential to reduce harmful tailpipe emissions, making it a legal requirement in many states to pass an emissions test or smog check. 
• Engine Protection: A failing or clogged converter restricts exhaust flow, forcing the engine to work harder, which can lead to reduced engine performance and eventual engine damage, including blown engine seals or failure. 
• Fuel Efficiency: By restoring proper exhaust flow, a new catalytic converter allows the engine to operate more efficiently, leading to better fuel economy. 
• Preventing Further Damage: A severely clogged converter can cause the exhaust system, and even the engine, to overheat, leading to significant and expensive damage. 

Signs of a Failing Catalytic Converter

• Rattling Noise: A failing converter may produce a rattling sound from the exhaust system. 
• Reduced Engine Performance: A sluggish engine or difficulty accelerating can be a sign of restricted exhaust flow. 
• Check Engine Light: The “Check Engine” light on your dashboard often illuminates when the catalytic converter is not functioning correctly. 
• Sulfur Smell: A strong rotten-egg (sulfur) smell from the exhaust can indicate a problem with the converter. 
• Failed Emissions Test: The most conclusive sign that your converter isn’t working is failing a smog or emissions inspection. 

Considerations Before Replacement

• Underlying Causes: A catalytic converter fails prematurely due to other issues, so it’s crucial to diagnose and fix the root cause, such as an engine misfire or a faulty O2 sensor, before replacing the converter. 
• Cost: Catalytic converters contain valuable precious metals and can be expensive, so compare prices from different shops and consider the vehicle’s overall value. 

How do you fix a catalytic converter without replacing it?

You can try to fix a catalytic converter without replacing it by using a fuel tank additive to burn off carbon buildup, or for a more involved, but potentially effective method, by removing and cleaning the converter with pressure washing or soaking. For a hole or crack, a high-temperature sealant can be used to patch the damage. However, if the converter is severely damaged or melted, it cannot be fixed and will need replacement. 
1. Use a Catalytic Converter Cleaner Additive

• How it works: These products are added to your fuel tank and help to break down carbon deposits in the exhaust system, including the catalytic converter. 
• To do it: Add the recommended amount of cleaner to your gas tank and drive the vehicle for a period of time, often requiring some sustained driving at high RPMs to get the converter hot enough to burn off the buildup. 
• When it’s best: This method is most effective for mildly clogged converters that have lost power over time. 

This video shows how to use a catalytic converter cleaner: 1mHonest Mechanic ColoradoYouTube · Nov 15, 2023
2. Clean the Catalytic Converter by Removing It

• How it works: This method involves removing the converter to more thoroughly clean out the internal structure. 
• To do it:
  • Access the converter: Safely lift your vehicle using a jack and secure it with jack stands. 
  • Clean: Use high-pressure water, a strong degreaser with hot water, or a dedicated chemical cleaner to dissolve and blast away the deposits. 
  • Dry completely: Make sure the converter is completely dry before reinstalling it. 
• When it’s best: This is a more intensive method, but it can be effective for more significant clogs. 

3. Patch a Small Hole

• How it works: A small hole or crack can sometimes be repaired with a special high-temperature sealant designed to withstand exhaust system temperatures. 
• To do it:
  • Clean the area: Ensure the area around the hole is clean and dry. 
  • Apply sealant: Apply the high-temperature gasketing cement or stove sealer over the hole. 
  • Cure completely: Allow the sealant to cure for at least two hours before starting the engine to ensure a strong bond. 
• When it’s best: This is only a viable option for small, localized damage to the catalytic converter’s housing. 

When replacement is necessary: 

• Severe blockage: If the catalytic converter is completely melted or blocked, cleaning solutions will not work, and it will need to be replaced.
• Internal damage: If the internal ceramic honeycomb structure is damaged or broken, the converter must be replaced.

What are the symptoms of a bad catalytic converter?

Symptoms of a bad catalytic converter include the illuminated “Check Engine” light, a sulfur or rotten egg smell from the exhaust, reduced engine power or sluggish acceleration, poor fuel economy, engine misfires or rough idling, dark exhaust smoke, a rattling noise from under the car, or excessive heat from the exhaust system. You may also fail an emissions test or find your car is hard to start or even stalls while driving. 
Performance & Driving Issues

• Reduced Engine Power: A clogged or damaged catalytic converter restricts exhaust flow, making the engine work harder and leading to a loss of power. 
• Poor Acceleration: You might notice that your car is slow to get up to speed or struggles to accelerate past a certain RPM. 
• Engine Misfires & Rough Idling: The engine’s inability to “breathe” can cause it to misfire or run roughly. 
• Stalling: A severely clogged converter can cause such high exhaust pressure that it leads to the engine stalling. 
• Jerking: Inconsistent acceleration due to the blocked exhaust can cause the vehicle to jerk. 

Sensory & External Clues

• Sulfur or Rotten Egg Smell: This smell is a classic sign that the converter isn’t properly processing sulfur particles, resulting in their emission from the exhaust. 
• Dark Exhaust Smoke: Proper function breaks down harmful particles, but if your exhaust is dark, it indicates these particles are still present. 
• Rattling Noise: Internal components of a damaged converter can break loose, creating a rattling sound, particularly when the engine is running. 
• Excessive Heat: A clogged converter can trap hot exhaust fumes inside, leading to high temperatures radiating from under the vehicle. 

Warning Lights & Tests

• Check Engine Light: The “Check Engine” light often illuminates, indicating a problem with engine performance or emissions, though a specific code for the converter may not be the only cause. 
• Failed Emissions Test: A faulty converter won’t properly reduce emissions, leading to a failed emissions test. 

What to Do

• Get it Inspected: If you notice any of these symptoms, have the vehicle inspected by a qualified mechanic as soon as possible. 
• Don’t Delay: Ignoring a bad catalytic converter can lead to more severe engine damage. 
• Use an OBD-II Scanner: A technician can use an OBD-II scanner to check for fault codes, which often start with P0420 or P0430 for catalytic converter issues.