P2237

O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1

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

What it means

P2237 means the PCM detected an open in the positive current-control circuit of the bank 1 sensor 1 air-fuel (wideband) sensor. Wideband sensors use a small pumping current to measure the air-fuel ratio, and an open in that circuit stops the sensor from reporting. It's an electrical fault of the sensor or its wiring; the engine keeps running on backup fueling but with worse economy until it's repaired.

Medium

Can I keep driving? Usually drivable, but the sensor can't report air-fuel ratio, so fueling runs open-loop with slightly worse economy — fix it soon.

Real-world scan data

Seen in

518

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2237 scans

P0683in 29.1% of scans

P0110in 24.5% of scans

P0100in 21.8% of scans

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 reduced fuel economy (fueling defaults to open-loop)
Possible mild hesitation or rough running
Often no strong driving symptom

Common causes

Most likely first

Open in the positive current control circuit of the bank 1 sensor 1 air-fuel (wideband) sensorLikely
Faulty wideband O2 / air-fuel sensorCommon
Sensor harness open or shortedCommon
Poor connection or corrosion at the sensor connectorLess often
Faulty PCM sensor driver (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and inspect the bank 1 sensor 1 connector and wiring for damage or corrosion.
Check the pumping/current control circuit for an open against the wiring diagram.
Verify the sensor's reference and control circuits are intact, key on/engine off.
Repair any open or high-resistance connection in the sensor harness.
If the circuit is good, replace the bank 1 sensor 1 air-fuel sensor and re-test.

FAQ

Quick answers

Is it safe to drive with P2237?+

Generally yes for the short term — the engine runs on backup fueling, but economy and emissions suffer until the sensor circuit is repaired.

Can I just clear P2237?+

It clears, but returns because this is an open-circuit fault; the wiring or sensor has to be fixed.

Read & clear P2237 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