P0135 1/1 O2 Sensor Heater Failure

SYMPTOM
P-0135 02S HEATER FAILURE

WHEN MONITORED
With the ignition key off, after the engine cools down.

SET CONDITION
No sensor output signal is received when the PCM powers up the sensor heater.

POSSIBLE CAUSES
- 1/1 02 sensor connector damaged
- 1/1 02 sensor gnd circuit open
- ASD relay output circuit open
- 1/1 02 sensor failure
- 1/1 02 sensor heater element failure
- 1/1 02s heater failure does not reoccur