Diagnostic Trouble Code
P2270 — O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
Definition
The downstream O2 sensor on Bank 2 is stuck reading lean. The signal voltage remains below the expected switching threshold, indicating the sensor is not oscillating normally.
Common Causes
- Faulty downstream O2 sensor on Bank 2
- Exhaust leak near the sensor
- Wiring or connector issue
- Catalytic converter issue affecting exhaust composition