Diagnostic Aids
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Check for any of the following conditions:
- Inspect for a restriction in the inlet air passage-A duct or inlet hose that collapses when hot or that is blocked by debris.
- Test for the correct fuel pressure-The fuel system will be rich if the fuel pressure is too high. In order to determine the cause of DTC P0172 or DTC P0175 monitoring the fuel pressure while driving the vehicle at various road speeds may be necessary. Refer to Fuel System Diagnosis .
- Inspect for a damaged wiring harness-Inspect the wiring harness for damage. If the harness appears to be OK, observe the heated oxygen sensor (HO2S) bank 1 or bank 2 sensor 1 display on the scan tool while moving the connectors and the wiring harnesses related to the sensor. A change in the display will indicate the location of the fault.
- Inspect for a contaminated oxygen sensor. readings. If contamination is found, determine the cause and correct the condition before replacing the HO2S.
- Inspect the HO2S bank 1 or bank 2 sensor 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.
- For an intermittent condition, refer to Intermittent Conditions .