Engine Error
P0031
HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
Severity
Medium
Symptoms
Decreased fuel economy, check engine light, rich running
Common Causes
- Failed O2 sensor heater element
- Short to ground in heater circuit
- Blown heater fuse
- Bad PCM
How to Fix
- 1 Replace Bank 1 Sensor 1 oxygen sensor
- 2 Inspect wiring for exposed wires
- 3 Replace blown fuses
- 4 Test heater voltage from PCM
Estimated Repair Cost
USD
$100
–
$350
O2 Sensor: $150 - $300