P2237 code meaning
O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 1)
Powertrain system Generic code P22xx codes Check engine light
What P2237 means
P2237 points to an open pump-current line (IP or APE) on the front wide-band sensor of bank 1. With that wire broken the output freezes near its stoichiometric value of roughly 1.5 V and lambda stops moving. Ford sets it on Bosch sensors when 20 s of fuel-control steps and reference-current pulses shift lambda by 0.05 or less; NTK interface chips report the open line directly. VW's 2014 books look for 1.49-1.51 V while the lambda controller deviates by more than 0.10 or fuel has been cut for over 3 s, and Saab's 9-5 2.0 turbo (2010) logs it as Type B. Software updates cure false or damaging cases on VW Jetta/Beetle 2.0 (2013-14, plus a new sensor) and Hyundai Kona 1.6 T-GDI (2024-25). P2238/P2239 are low/high, P2240 is bank 2.
P2237 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2237
- Check engine light
- Lambda reading stuck at 1.0 in live data
- Higher fuel consumption in open-loop fuelling
Common causes of P2237
- Most likelyBroken pump-current wire or pushed-back pin between sensor and ECM
- PossiblePump cell of the wide-band sensor damaged, for example by catalyst-heating strategy or thermal shock
- Less likelyEngine software that sets the code falsely (update available for some models)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank1 sensor1Oxygen sensor wiringECM
What each part of P2237 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 37 | The exact fault in that area. |
What to do next
- Note P2237 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2237
What does P2237 mean?
P2237 means "O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 1)". P2237 points to an open pump-current line (IP or APE) on the front wide-band sensor of bank 1. It is a generic code, so it means the same on every make.
Is it safe to drive with P2237?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2237 fail an emissions test?
Yes, it can. P2237 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2237 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2237 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.