Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Observe the DTC information with a scan tool. Verify there are no HO2S, fuel system, or misfire DTCs set.
- If there are any HO2S, fuel system, or misfire DTCs set, diagnosis the applicable DTC before proceeding with this diagnostic procedure. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Inspect and verify the following:
- The catalytic converter is an original part
- The HO2S 2 is secure and the wiring is not damaged, or contacting the exhaust
- The exhaust system for leaks, damage, or missing hardware
- If a condition is found, repair as necessary.
- If a condition is not located, replace the appropriate catalytic converter.
IMPORTANT:
Before replacing the catalytic converter, correct any conditions that may have damaged the converter.