Diagnostic Aids
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fuel with a high sulfur or lead content can degrade marginal converter's performance. Be sure to check the fuel quality.
An intermittent may be caused by any of the following conditions:
- A poor connection.
- Rubbed-through wire insulation.
- A broken wire inside the insulation.