P0135

Tests 1 - 3:

Tests 4 - 7:

SYMPTOM
P0135 - 1/1 O2 SENSOR HEATER FAILURE

WHEN MONITORED
At ignition OFF when certain enabling conditions are met.

SET CONDITION
O2 sensor voltage does not change as expected over a specific amount of time during the O2 Sensor Heater Monitor.

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