P0161

Test 1 - 4:

Test 5:

SYMPTOM
P0161-O2 SENSOR 2/2 HEATER PERFORMANCE

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

WHEN MONITORED
Engine running and heater duty cycle greater than 0%. Battery voltage greater than 11.0 volts.

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

POSSIBLE CAUSES
- O2 sensor heater operation
- O2 heater element
- O2 heater ground circuit open
- O2 heater control circuit open
- PCM