P0135 1/1 O2 Sensor Heater Failure

SYMPTOM
P-0135 1/1 O2 SENSOR HEATER FAILURE

WHEN MONITORED
See DRB III. With the engine at idle immediately after a cold start (engine < 147 degrees F and battery temp ± 27 degrees F of engine temperature).

SET CONDITION
See DRB III. O2 sensor voltage > 3V for 30 to 90 seconds.

POSSIBLE CAUSES
- 1/1 O2 sensor connector damaged
- 1/1 O2 sensor gnd circuit open
- ASD relay output circuit open
- 1/1 O2 sensor failure
- 1/1 O2 sensor heater element failure
- 1/1 O2S heater failure does not reoccur