Engine Error
P0151
O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
Severity
Medium
Symptoms
Engine hesitation, lean running condition, poor acceleration
Common Causes
- Faulty Bank 2 upstream O2 sensor
- Vacuum leak on Bank 2 side of engine
- Low fuel pressure
- Short to ground in signal wire
How to Fix
- 1 Replace Bank 2 Sensor 1
- 2 Check for intake manifold leaks
- 3 Test fuel pressure output
- 4 Repair grounded wiring
Estimated Repair Cost
USD
$100
–
$400
O2 sensor: $150 - $350; Leak test: $100