P0161

Test 1 - 3:

Test 4 - 6:

SYMPTOM
P0161-O2 SENSOR 2/2 HEATER FAILURE

TEST NOTE
This symptom is diagnosed using the P0135-O2 SENSOR 1/1 HEATER FAILURE.

WHEN MONITORED
With battery voltage greater than 10.5 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 60 to 240 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
- PCM