Engine Error
P0157
O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
Severity
Low
Symptoms
Check engine light, failed emissions test
Common Causes
- Defective Bank 2 downstream O2 sensor
- Exhaust leak near the sensor
- Short to ground in wiring
- Failing catalytic converter
How to Fix
- 1 Replace downstream O2 sensor
- 2 Fix exhaust leak
- 3 Repair shorted wire
- 4 Inspect catalytic converter
Estimated Repair Cost
USD
$100
–
$400
O2 sensor: $150 - $300