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P2237: Oxygen sensor current control circuit open (bank 1, sensor 1)

Electrical fault on one wire of the wideband oxygen sensor before the bank 1 catalyst. Usually the connector, the wiring or the sensor.

Code P2237 at a glance
CodeP2237
SystemEngine and transmission
GroupP22xx, NOx sensors, oxygen sensors and emissions
TypeGeneric: it means the same on every make
Can you keep driving?With care

What P2237 means

Many modern engines use a wideband oxygen sensor ahead of the catalytic converter, which the ECU controls by sending it a small current. This code means the circuit that carries that current is open (broken) or not working. Without it, the ECU cannot measure the mixture properly and falls back on default values.

Most common causes

  • Loose, dirty or corroded sensor connector
  • Sensor wire broken or burnt by the exhaust
  • Faulty wideband oxygen sensor
  • Damaged sensor wires inside the loom (chafing)
  • Fault in the ECU circuit (uncommon)

Symptoms

  • Engine warning light on
  • Higher fuel consumption
  • Slightly rough idle
  • Possibly weaker engine response

Can you drive with P2237?

With care You can drive, but without the sensor the mixture is not controlled precisely: consumption rises and the catalyst can suffer over time. Have it seen to soon.

How to check it

Inspect the sensor lead from the exhaust to its connector for melted or chafed sections. With your reader, check whether bank 1 sensor 1 shows a live reading; if it is fixed or missing with the engine warm, that confirms the fault.

How to read and clear P2237 with Final OBD

Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2237 with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

P2237 is a generic code, so it means the same on any make, for example on Citroën, Hyundai, Mercedes-Benz, Mini, Renault, Volvo. See what Final OBD does on your car in makes and models.

What does code P2237 mean?

Many modern engines use a wideband oxygen sensor ahead of the catalytic converter, which the ECU controls by sending it a small current. This code means the circuit that carries that current is open (broken) or not working. Without it, the ECU cannot measure the mixture properly and falls back on default values.

Can you drive with P2237?

You can drive, but without the sensor the mixture is not controlled precisely: consumption rises and the catalyst can suffer over time. Have it seen to soon.

How do you clear P2237?

With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2237 comes back.