Q: Check Engine light for catalytic converter

If you are not experiencing drivability issues, the catalytic converters may be starting to become inefficient. Catalytic converters often times are ruined by raw fuel in your exhaust system. Misfires that go unresolved are usually the cause of this. A technician, such as one from YourMechanic, will typically use a back pressure gauge to test the catalytic converter for inefficiency and replace it if necessary.