Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

1. 3
   
   This step inspects for conditions that can cause the 3-way catalytic converter efficiency to appear degraded.
2. 5
   
   A catalytic converter which has been discolored may be due to an engine running rich, lean or had a previous sever misfire. Verifying the fuel trim percentages may be of assistance in determining if such a condition exists.