P0141

Test 1 - Test 4:

Test 5:

SYMPTOM
P0141-O2 SENSOR 1/2 HEATER PERFORMANCE

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

WHEN MONITORED
Engine running and heater duty cycle greater than 0%. ASD Relay is energized. Battery voltage greater than 10.4 volts.

SET CONDITION
No sensor output is received when the PCM powers up the sensor heater. O2 heater is out of control for 128 seconds after it has reached 350 deg C. Two trip fault.

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