P0150

O2 Sensor Circuit Bank 2 Sensor 1

Q: Is it safe to drive with P0150?

Yes, in the short term. The engine still runs, but with the bank 2 upstream sensor faulted the ECM can't fine-tune that bank's mixture, so fuel economy and emissions suffer. It's not an emergency but shouldn't be ignored.

Q: Can I just clear P0150?

It will return once the ECM re-tests the sensor if it's still faulty. Replacing the sensor or repairing its circuit is what keeps the code off.

Fuel & air metering / O2 sensor Generic OBD-II Medium

What it means

P0150 means the ECM detected a general circuit fault with the upstream oxygen sensor on bank 2 (sensor 1, before the catalytic converter). That sensor reports the air/fuel mixture so the engine can trim fuel in closed loop. With it faulted, the ECM loses accurate feedback for that bank, so the car keeps running but with worse fuel economy and emissions. Bank 2 is the side of the engine that doesn't contain cylinder 1.

Medium

Can I keep driving? Safe to drive — the engine runs, but fuel control on bank 2 is off, so expect worse economy and emissions until the sensor is fixed.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Poor fuel economy
Slightly rough running or hesitation
Failed emissions test

Common causes

Most likely first

Failed upstream (bank 2, sensor 1) O2 sensor — most commonLikely
Damaged wiring or a corroded connector at the sensorCommon
Exhaust leak near the sensor skewing its readingCommon
Vacuum leak affecting the bank 2 air/fuel mixtureLess often
Rarely, an ECM faultLess often

How to diagnose & fix

Work through it in order

Scan the live bank 2, sensor 1 O2 data and check whether it switches normally or is stuck/flatlined.
Inspect the sensor's connector and wiring for corrosion, damage, or heat melting.
Check for exhaust leaks ahead of the sensor and vacuum leaks on bank 2.
Replace the upstream bank 2 O2 sensor if it fails to respond, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0150?+

Yes, in the short term. The engine still runs, but with the bank 2 upstream sensor faulted the ECM can't fine-tune that bank's mixture, so fuel economy and emissions suffer. It's not an emergency but shouldn't be ignored.

Can I just clear P0150?+

It will return once the ECM re-tests the sensor if it's still faulty. Replacing the sensor or repairing its circuit is what keeps the code off.

Read & clear P0150 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX