Diagnostic Aids

Check for any of the following conditions:

• If a DTC P0032 is intermittent, driving the vehicle under the conditions outlined in the Inspection/Maintenance (I/M) section for HO2S tests can verify whether the fault is present.
• The HO2S heater diagnostic checks for many of the faults that can cause DTC P0032 to set. If the HO2S heater test passes, the cause of the DTC is probably intermittent. Clear the DTC information. Road test the vehicle while monitoring the HO2S heater test in the I/M System Information selection on the scan tool. When the HO2S heater test indicates complete with a YES status, check for a DTC P0032 under Last Test Failed. If there is no DTC P0032 indicated, the DTC is intermittent and the HO2S heater diagnostic is indicating OK at this time.
• An intermittent malfunction may be caused by a fault in the HO2S 1 sensor electrical circuit. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .
• Repair any electrical circuit faults that were found. Refer to Wiring Repairs .