P2251
O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1
P2251 is an OBD-II diagnostic trouble code meaning: O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1. Common causes: broken or damaged oxygen sensor wiring, poor contact in the sensor connector. Estimated repair cost: $17–89.
Symptoms
- Check Engine light comes on
- Increased fuel consumption
- Unstable engine idling
- Reduced engine power
- Dips during acceleration
Causes
- Broken or damaged oxygen sensor wiring
- Poor contact in the sensor connector
- Malfunction of the oxygen sensor itself
- Problems with the engine ECU
- Short circuit in control circuit
How to Fix
- Check the integrity of the wiring and connectors of the sensor
- Clean the contacts of the oxygen sensor connector
- Check control circuit resistance
- Replace the oxygen sensor if necessary
- Check the performance of the engine ECU
Related codes
Error P2251 by Vehicle Brand
FAQ
What does the P2251 code mean?
P2251 is an OBD-II diagnostic trouble code that indicates: O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1
What causes a P2251 error code?
The most common causes of P2251 include: Broken or damaged oxygen sensor wiring; Poor contact in the sensor connector; Malfunction of the oxygen sensor itself; Problems with the engine ECU.
How do I fix a P2251 diagnostic trouble code?
To fix P2251: Check the integrity of the wiring and connectors of the sensor. Clean the contacts of the oxygen sensor connector. Check control circuit resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2251?
Yes, but get it checked soon
How much does it cost to fix P2251?
The estimated repair cost for P2251 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat