P0161

Test 1 - 4:

Test 5 - 6:

SYMPTOM
P0161-2/2 O2 SENSOR HEATER FAILURE

TEST NOTE
This symptom is diagnosed using the test P0135-1/1 O2 SENSOR HEATER FAILURE (6 CYLINDER).

WHEN MONITORED
During vehicle shutdown after vehicle had been driven greater than 10 miles with throttle open for a minimum of 3 minutes. Battery voltage greater than 11.0 volts.

SET CONDITION
No sensor output is received when the ASD powers up the sensor heater. Two trip fault.

POSSIBLE CAUSES
- Good trip equal to zero
- O2 sensor heater operation
- O2 heater element
- O2 sensor heater ground circuit open
- ASD relay output circuit open
- PCM