Supra L6-3.0L DOHC (7M-GE) (1990)
Catalytic Converter: Testing and Inspection
If exhaust system back-pressure and/or exhaust emission levels are excessive, remove the catalytic converter from the car and make a visual check for
plugged, melted or cracked ceramic grid inside. If any of the visible areas are damaged, replace the catalytic converter. Inspect supplemental three-way
catalytic converter in the same manner, on California vehicles equipped with two TWC's.