Catalytic Converter: Testing and Inspection

Fig. 50 Three Way Catalytic Converter Exploded View (HF):

If excessive exhaust system back-pressure is suspected, or if tailpipe emissions are high and all other systems check OK, remove the catalytic converter from the car and make a visual check for plugging, melting, or cracking of the ceramic grid inside. If any visible areas are damaged, replace the catalytic converter.