The other half of the wideband sensor circuit is open — same family as P2237 and the same repair in most cases.
P2251 — also written P2251, P 2251, 2251 — is the OBD-II code for o2 sensor negative current control circuit open (bank 1, sensor 1). Same code, same fix: this page covers every spelling of it.
P2251 is a emissions fault code, typically costing £120–£450 to put right in a UK garage.
What causes P2251?
- Failed wideband sensor
- Damaged wiring
- Corroded connector
How P2251 is fixed
- Replace the sensor
- Repair the connector and loom
P2251 repair cost in the UK
Most P2251 repairs land between £120–£450 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2251?
Yes, with worse economy until fixed.
Urgency: medium.