Q: What is the recommended action for replacing a catalytic converter due to a federally mandated extended warranty on Jeep Comanche?
A: Due to a Federal warranty covering emissions-related parts like the catalytic converter, it's advised to consult a dealer before replacing it yourself. The converter, an emission control device, comes in two types: the oxidation catalyst and the three-way catalyst. If you suspect malfunction, take it to a dealer or authorized facility for diagnosis. Check the converter for leaks, corrosion, or dents when servicing under body parts. If damaged, replace it. Use a vacuum gauge to diagnose plugged converters by checking for blocked exhaust. If pressure doesn't significantly increase, the exhaust system or converter may be blocked.