P0037

Test 1 - 4:

Test 5:

SYMPTOM
P0037-O2 SENSOR 1/2 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
Desired state does not match Actual state.

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