Catalytic Converter: Testing and Inspection

Exhaust system performance complaints, such as excessive back pressure, are noticeable by their effect on engine performance. However, other malfunctioning vehicle components have similar effects on engine performance and are characterized by the same symptoms or complaints. Therefore, it may be necessary to refer to the specific Engine Components for the vehicle being serviced to diagnose these types of problems. For diagnosis of typical exhaust system complaints, refer to Exhaust System.