P2272

O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2

Q: Is it safe to drive with P2272?

Yes — this is the downstream (post-catalyst) sensor, so it does not change how the engine runs. Fix it to pass emissions and keep fuel-trim accurate.

Q: Can I just clear P2272?

It will come back within a few drive cycles unless the sensor, its wiring, or a nearby exhaust leak is actually repaired.

Fuel & air metering (oxygen sensor) Generic OBD-II Medium

What it means

P2272 means the downstream oxygen sensor on bank 2 (after the catalytic converter) is reporting a signal stuck on the lean side instead of switching normally. It is most often a failing sensor, its wiring, or a small exhaust leak drawing in outside air. The car drives normally, but it will not pass an emissions test until the sensor reads correctly.

Medium

Can I keep driving? Yes — the car drives normally. This is the downstream sensor, so the main effect is a warning light and a likely emissions-test failure.

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
Fails an emissions/readiness test
Possible slight increase in fuel consumption
Often no noticeable change in how the car drives

Common causes

Most likely first

Faulty downstream oxygen sensor (bank 2, sensor 2)Likely
Open, shorted, or corroded wiring or connector at that sensorCommon
Exhaust leak upstream of the rear sensor letting in outside airCommon
Contaminated sensor from oil or coolant burning in the engineLess often
Failed catalytic converter skewing the downstream reading, less likelyLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and confirm the code is bank 2, sensor 2 (the sensor after the converter on the bank opposite cylinder 1).
Inspect the sensor's wiring and connector for damage, corrosion, or a loose pin.
Check for exhaust leaks near the sensor and repair them first.
Compare the sensor's live signal against a known-good sensor; replace it if it stays biased lean.
Clear the code and re-test over a full drive cycle.

FAQ

Quick answers

Is it safe to drive with P2272?+

Yes — this is the downstream (post-catalyst) sensor, so it does not change how the engine runs. Fix it to pass emissions and keep fuel-trim accurate.

Can I just clear P2272?+

It will come back within a few drive cycles unless the sensor, its wiring, or a nearby exhaust leak is actually repaired.

Read & clear P2272 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