Catalytic converters fail from age, from misfires that overheat them, or they get stolen in a parking lot with a cordless saw. Before we replace one for a P0420 code we verify the sensors and check for the root cause, because a converter is expensive and a new one dies the same way if the misfire isn't fixed. We install direct-fit, EPA-compliant units.
Signs you need catalytic converter replacement
- P0420 or P0430 code that persists after sensor checks
- Rotten-egg smell
- Loss of power and rattling under the car (broken substrate)
- Converter was cut off and stolen
What we do on site
- Verify the failure with sensor data and a backpressure test
- Fix the root cause — misfire, oil consumption, or coolant leak
- Replace the converter with a direct-fit, EPA-compliant unit
- Replace O2 sensors if damaged
- Clear codes and drive to set readiness monitors
Doing this in a driveway
Bolt-on converters are mobile. Welded-in units on some vehicles require a shop, and we'll refer you if yours is one.
Parts we use
Direct-fit catalytic converter, gaskets, flange bolts, oxygen sensors as needed.
Pricing: One of the more expensive parts on a car; we always confirm the diagnosis first. Every job is quoted in writing before we start, and there's no upsell — how our pricing works.
FAQ
Catalytic Converter Replacement: common questions
Can you install a universal converter to save money?
Universal units require welding and are not legal on many vehicles. We install direct-fit units that bolt in and comply with EPA requirements.