Fault Code P2251
Code meaning, symptoms, possible causes, part number, and estimated cost.
P2251
O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1
This code indicates a fault in the negative current control circuit or an open circuit in the O2 sensor for Bank 1, Sensor 1. This fault affects the accuracy of sensor readings and can lead to an incorrect fuel mixture.
Part Details
Part Name
O2 Sensor
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪400 - ₪1200
Engine Location
Exhaust pipe, before the catalytic converter
Symptoms
- Check Engine Light on
- Increased fuel consumption
- Poor engine performance
- High emissions
Possible Causes
- 1Faulty oxygen sensor
- 2Broken or shorted wiring in the sensor circuit
- 3Loose or corroded connections
- 4Engine Control Module (ECM) malfunction
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