P0051

Tests 1 - 3:

Tests 4 - 6:

SYMPTOM
P0051-2/1 O2 SENSOR HEATER CIRCUIT LOW

TEST NOTE
This symptom is diagnosed using the test P0031-1/1 O2 SENSOR 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 equal Actual state.

POSSIBLE CAUSES
- Heater control circuit open
- Intermittent condition
- Heater element check
- Fused O2 heater feed circuit open
- PCM