Diagnostic Aids

Check for oxygen sensor pigtail wire breaks, contamination or grounding on exhaust manifold. Check for intermittent ground in signal wire between sensor connector and sensor. DO NOT attempt to repair damaged oxygen sensor connector or wiring. If damage is detected, replace oxygen sensor.

Scan tool voltage varies within a range of 150-850 mV in closed loop. DTC P0134 will set in about 88 seconds when voltage is 407-509 mV. System goes into open loop in about 30 seconds.