The catalytic converter is a critical emissions control component of the exhaust system. A properly functioning engine fuel system is necessary to preserve the integrity and function of the vehicle’s catalytic converter(s).

The check engine light codes, P0420 and P0430, indicating a catalytic converter efficiency issue are sometimes the result of engine fuel trim problems. When short or long-term fuel trim performance is not proper the catalytic converter is not able to function efficiently. Therefore, the converter is not able to function efficiently. This does not necessarily mean the converter has malfunctioned. Without addressing the fuel-trim issue, simply replacing the converter(s) will not solve all the vehicle’s problems. Other check engine light codes, such as P030(#) for engine misfires and P014(#) for lean/rich conditions, should repaired prior to converter replacement. When the un-burned fuel caused by an un-diagnosed fuel management problem works its way down to the converter, it can cause the converter to super-hear to temperatures far beyond the normal operating parameters.

It is highly recommended to use an OEM catalytic converter when its replacement is required. To learn more about engine fuel trim issues and diagnosis CLICK HERE!

The experts at Hollenshade’s in Towson can address any problems you may be experiencing with your vehicle’s emission control system and check engine light. Please CONTACT US for an appointment or to ask a question about vehicle diagnosis or maintenance services.