P0057

Test 1 - 4:

Test 5:

SYMPTOM
P0057-O2 SENSOR 2/2 HEATER CIRCUIT LOW

TEST NOTE
This symptom is diagnosed using the test P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW.

WHEN MONITORED
Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is on.

SET CONDITION
The PCM detects the O2 Heater voltage is out of acceptable range. Below 0.0926 of a volt. One Trip Fault.

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