P0135

Test 1 - 3:

Test 4 - 7:

SYMPTOM
P0135-O2 SENSOR 1/1 HEATER FAILURE

WHEN MONITORED
With battery voltage greater than 9 volts, at a cold start, ECT less than 147 °F, battery temperature sensor equal to or less than 27 °F, and engine at idle for at least 12 seconds.

SET CONDITION
O2 sensor voltage greater than 3 volts for 30 to 90 seconds.

POSSIBLE CAUSES
- O2 sensor heater operation
- O2 heater element
- O2 heater supply circuit open
- Heater control circuit open
- Heater control circuit shorted to ground
- Heater ground circuit open
- PCM