P0031

Tests 1 - 3:

Tests 4 - 6:

SYMPTOM
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 match Actual state.

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