Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic procedures.

3

This table checks for conditions that can cause the three-way catalytic converter efficiency to appear degraded. Inspect and repair exhaust system as necessary.

6

Before the three-way catalytic converter is replaced, make sure that the following conditions are not present:
- Misfire.
- High engine oil consumption or coolant consumption.
- Retarded spark timing or weak spark.