Catalytic Converter Replacement
ProfessionalCatalytic converter replacement involves removing the old converter from the exhaust system and installing a new one. The catalytic converter reduces harmful emissions by converting toxic exhaust gases into less harmful compounds. Failure causes a check engine light, failed emissions tests, reduced performance, and a sulfur smell from the exhaust.
Estimated time: 2-4 hours
Cost Breakdown
DIY (Parts Only)
$300 - $1500
Professional Shop
$800 - $2500
Prices vary by location, vehicle make/model, and shop rates.
Tools Needed
- Socket wrench set
- Jack and jack stands
- Penetrating oil
- Exhaust pipe cutter or reciprocating saw
- Torque wrench
- Oxygen sensor socket
Step-by-Step Instructions
Raise the vehicle on jack stands and apply penetrating oil to all exhaust flange bolts and oxygen sensor connections.
Disconnect the upstream and downstream oxygen sensors from the catalytic converter using an O2 sensor socket.
Remove the flange bolts connecting the converter to the exhaust manifold and the mid-pipe. If bolts are seized, an exhaust pipe cutter may be needed.
Remove the catalytic converter and any supporting hangers or brackets.
Compare the old and new converters to confirm correct fitment and sensor bung locations.
Install the new converter with new gaskets at both flanges. Torque all flange bolts to specification.
Reinstall the oxygen sensors into the new converter, then lower the vehicle and clear the check engine codes.
Start the engine and check for exhaust leaks at all connection points. Drive the vehicle to complete the readiness monitors.
Tips & Warnings
- Catalytic converters must meet EPA regulations. Ensure the replacement is CARB-compliant if you live in California or a CARB-adoption state.
- Always diagnose the root cause of converter failure before replacing — misfires, oil burning, or coolant leaks can destroy a new converter.
- OEM converters are much more expensive than aftermarket but typically last longer and meet stricter emissions standards.
- Catalytic converter theft is common. Consider installing a protective shield or cage on the new converter.
Related OBD-II Codes
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Recommended Parts & Tools
catalytic converter replacement
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