| Subject: | Diagnostic Trouble Code (DTC) P0132 (HO2S Circuit High Voltage Sensor 1),
P0138 (HO2S Circuit High Voltage Sensor 2), or P0172 (Fuel Trim System Rich) Diagnostic
Enhancements |
| Models: | 2003-2004 Saturn ION Vehicles |
| Built Up To and Including
VIN Breakpoint 4Z202060 |
| Attention: | Fixed Operations Manager and Technician |
Some vehicles may exhibit DTC P0132, P0138 and/or P0172 or drivability
symptoms related to a rich combustion mixture.
In some cases, leakage through the purge valve may cause a rich engine condition
detected by either of the listed DTCs.
Diagnostic Procedures
- If a vehicle is being serviced for any of the issues mentioned above,
refer to the appropriate DTC diagnostic procedure in the Engine Controls - 2.2L
section of the 2003 or 2004 Saturn ION Service Manual, Vol. 1 or in SI ("DTC
List," SI Document ID #882200 [2003] or 1285325 [2004]) to diagnose the condition.
- If the condition is not corrected after completing the Service Manual
diagnostic procedure for the specific DTC, continue with the diagnostic procedure
for DTC P0496 (Evaporative Emission (EVAP) System Flow During Non-Purge).
