Engine Error
P0156
O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
Severity
Low
Symptoms
Check engine light on, failed state emissions test
Common Causes
- Faulty downstream O2 sensor on Bank 2
- Corroded or loose electrical connector
- Damaged wiring near the exhaust
- Exhaust pipe leak
How to Fix
- 1 Replace Bank 2 Sensor 2 O2 sensor
- 2 Clean connector contacts
- 3 Repair wiring and secure away from heat
- 4 Weld or clamp exhaust leak
Estimated Repair Cost
USD
$100
–
$300
O2 sensor replacement: 150 - 300