P0136

Tests 1 - 2:

Tests 3 - 6:

Test 7:

SYMPTOM
P0136-1/2 O2 SENSOR HEATER CIRCUIT MALFUNCTION

WHEN MONITORED
Ignition ON, with battery voltage greater than 10.4 volts.

SET CONDITION
The state of the PCM relay control circuit, between the PCM and relay coil, does not match the desired state.

POSSIBLE CAUSES
- Intermittent condition
- O2 Sensor heater relay supply circuit open or short to ground
- O2 Sensor heater relay control circuit open
- O2 Sensor heater relay control short to ground
- O2 Sensor heater relay coil open
- PCM