Catalytic Converter Replacement
How are catalytic converter issues diagnosed?
It depends on the type of failure. If the car is experiencing a loss of power, a back-pressure test can check for a clog. If the check engine light is on, it may include a code that points to the converter. Or, if rattling noises are heard, the technician would need to confirm they are coming from the converter instead of other exhaust components.
How is a catalytic converter replaced?
Most converters are bolted in place in the exhaust system, though some are welded or clamped down. Whatever the case, the converter must be loosened and removed.
Some catalytic converters are built directly into the exhaust manifold, because they work most efficiently when hot. Never touch a catalytic converter while the engine is running or any time soon after it's been shut off.
RepairPal recommendations for catalytic converter issues
Engine operation should the thoroughly checked after replacing a faulty converter. Failure to do so could result in failure of the new converter.
It's important to use high-quality, OEM parts when replacing the catalytic converter. Using cheaper parts can cause future problems and can prevent a car from passing emissions testing.
What to look out for when dealing with catalytic converter issues
Many vehicles have more than one catalytic converter, so care should be taken to make sure the correct converter is diagnosed or replaced.
Can I replace the catalytic converter myself?
A catalytic converter can either be bolted or welded in place. In most cases, a converter bolted in place can be removed using basic hand tools — just be sure to use penetrating oil before attempting to remove exhaust system components.
If the converter is welded in place, some sort of cutting device will be necessary to remove it. Be sure to check your vehicle to see what you have before attempting this repair. Having the necessary tools on hand before starting will help the job run smoothly. If you don't have the right tools for the job, it's better to let a repair shop handle the job.