What it means
Same condition as P0130 but on bank 2 of a multi-bank engine. Closed-loop fuel control on bank 2 is disabled while this fault is active.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 Sensor 1 is the upstream oxygen sensor used for fuel-control feedback on Bank 2 of a multi-bank engine. P0150 sets when the control module detects a malfunction in that sensor's circuit, so it may not be able to rely on the bank's oxygen feedback.
Common causes
Most likely first.
- Oxygen sensor aged
- Sensor harness chafed
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
How to diagnose it
- Read freeze-frame data and check live Bank 2 Sensor 1 readings and related fault codes to see whether the signal is absent, erratic, or inconsistent.
- Inspect the Bank 2 Sensor 1 harness and connector for chafing, heat damage, loose pins, or corrosion.
- Check the sensor circuit and connector continuity using the manufacturer's wiring diagram and procedure.
- Check for exhaust leaks or visible sensor contamination that could contribute to abnormal readings.
- If the circuit is intact, test the Bank 2 Sensor 1 sensor operation as specified by the manufacturer and replace it only if it fails.
Common fixes
- Reconnect or clean corroded Bank 2 Sensor 1 connector contacts as appropriate.
- Repair a chafed or heat-damaged sensor harness.
- Repair an exhaust leak affecting the upstream sensor reading.
- Replace Bank 2 Sensor 1 if circuit testing confirms sensor failure.
Can I keep driving?
The vehicle may remain drivable, but Bank 2 fuel control can be less accurate, increasing fuel use and emissions. Keep trips short and gentle if the engine runs poorly, and avoid driving if a severe misfire develops.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.