Engine Error
P0143
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
Severity
Low
Symptoms
Check engine light on, minor exhaust smell
Common Causes
- Short to ground in sensor 3 signal wire
- Defective Bank 1 Sensor 3 O2 sensor
- Exhaust leak upstream of sensor
- Failing catalytic converter
How to Fix
- 1 Repair grounded wiring
- 2 Replace the O2 sensor
- 3 Fix exhaust manifold or pipe leaks
- 4 Inspect catalytic converter
Estimated Repair Cost
USD
$100
–
$350
Wiring repair: $100; O2 sensor: $150 - $350