Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- A lean condition during a high fuel demand situation due to a fuel pump that does not deliver enough fuel, a plugged fuel filter, or a restricted fuel pipe can set a DTC P0171.
- Check for a contaminated oxygen sensor. Silicone and other contaminants can cause the oxygen sensor to provide false exhaust oxygen content readings. If contamination is found, determine the cause and correct the condition before replacing the HO2S.
- Inspect the HO2S 1 for water intrusion into the wiring harness and the sensor housing. Water can create a short to voltage in the HO2S signal circuit causing a false rich indication.