Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Check for the following conditions:

Check wiring harness for damage. If harness appears to be OK, observe HO2S 2 display on scan tool while moving connectors and wiring harnesses related to the sensor. A change in HO2S 2 display will indicate location of the fault.
If a DTC P0136 is intermittent, driving vehicle under the conditions outlined in Inspection/Maintenance (I/M) procedures can verify whether the fault is present. See INSPECTION/MAINTENANCE HEATED OXYGEN SENSOR/OXYGEN SENSOR (HO2S/O2S) SYSTEM SET PROCEDURE under INSPECTION/MAINTENANCE PROCEDURES (DRIVE CYCLES).
An intermittent malfunction may be caused by fault in the HO2S circuit sensor electrical circuit. Check the wiring harness and components for an intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 1.8L VIBE article.
Repair any electrical circuit faults found. The information included in freeze frame data can be useful in determining vehicle operating conditions when DTC first set.