P2248

O2 Sensor Reference Voltage Performance Bank 2 Sensor 1

Q: Is it safe to drive with P2248?

Yes, for the short term. The car runs in open-loop with slightly worse economy, but there is no stalling risk; repair it before it affects emissions or the catalyst.

Q: Can I just clear P2248?

It returns until the sensor or its reference-voltage circuit is repaired, since the ECM checks that reference whenever the sensor is active.

Fuel & air metering (O2 sensor) Generic OBD-II Medium

What it means

P2248 means the reference voltage feeding the upstream wideband air-fuel (O2) sensor on bank 2, sensor 1 is out of its expected range. That reference lets the sensor accurately measure the exhaust mixture; when it drifts the ECM runs open-loop, so the car stays drivable but may idle rough and use a little more fuel until the sensor or its wiring is corrected.

Medium

Can I keep driving? Drivable — with the upstream sensor circuit faulted the ECM runs open-loop, so expect slightly worse economy and possibly rough idle, but no stalling risk.

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
Slightly rough or uneven idle
Increased fuel consumption
Minor hesitation or surging

Common causes

Most likely first

Faulty upstream air-fuel ratio (wideband O2) sensor, bank 2 sensor 1Likely
Reference voltage circuit out of range — wiring open, shorted, or high-resistanceCommon
Poor or corroded connection at the sensorCommon
Faulty ECM/PCM reference supplyLess often

How to diagnose & fix

Work through it in order

Read freeze-frame and check for companion sensor codes (P2247, P2249, P2250).
Inspect the bank 2 sensor 1 connector and wiring for corrosion, chafing, or exhaust-heat damage.
Measure the sensor's reference voltage circuit and compare it to spec.
Confirm the ECM is supplying a stable reference voltage to the sensor.
If the wiring and reference are good, replace the bank 2 sensor 1 air-fuel/O2 sensor and retest.

FAQ

Quick answers

Is it safe to drive with P2248?+

Yes, for the short term. The car runs in open-loop with slightly worse economy, but there is no stalling risk; repair it before it affects emissions or the catalyst.

Can I just clear P2248?+

It returns until the sensor or its reference-voltage circuit is repaired, since the ECM checks that reference whenever the sensor is active.

Read & clear P2248 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