Diagnostic Aids
WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Inspect for the conditions listed below, which may cause a catalytic converter to degrade:
- Engine misfire.
- High engine oil or high coolant consumption.
- Retarded spark timing.
- Weak or poor spark.
- Lean fuel mixture.
- Rich fuel mixture.
- Damaged oxygen sensor or wiring harness.