- Check Engine Light: This is the most common sign. The light might come on and off.
- Reduced Engine Performance: Your car might feel sluggish or lack power when accelerating.
- Rattling Noises: A damaged converter can cause a rattling sound coming from underneath the car.
- Failed Emissions Test: If your car fails an emissions test, the catalytic converter is a likely culprit.
- Sulfur Smell: A rotten egg or sulfur smell can indicate a problem.
Testing the catalytic converter:
- Visually inspect the converter for damage like dents or rust.
- Use a scan tool to check for diagnostic trouble codes (DTCs) related to the converter.
- Check the exhaust system for leaks.
- A professional can perform a temperature test before and after the converter to check its efficiency.
Common failure causes:
- Overheating: Running too rich (too much fuel) can overheat and damage the converter.
- Physical Damage: Road debris or accidents can damage the converter.
- Contamination: Oil leaks or coolant leaks can contaminate the converter.
- Age: Catalytic converters wear out over time.
