P0155

Tests 1 - 5:

Test 6:

SYMPTOM
P0155 - 2/1 O2 SENSOR HEATER FAILURE

TEST NOTE
This symptom is diagnosed using the test P0135 - 1/1 O2 SENSOR 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
- Open ASD relay output circuit
- O2S heater ground circuit open
- Wiring harness intermittent problem
- O2S
- PCM