OBD II Fault Code P2251 :

Description of Fault code P2251

A/F SENSOR NEGATIVE CURRENT CONTROL CIRCUIT OPEN

Possible failuer P2251

• A/F sensor harness open.

Diagnostic Procedure using AutoHex II Scan Tool

• Harness open is indirectly detected by Oxygen Concentration and Sensor Temperature.

Test Conditions using AutoHex tester

• Engine running (Detection state can be confirmed by OBD STATUS)
• BATTERY voltage ≥ 10.7V

Clear Fault codes Conditions

• Harness open is indirectly detected by Oxygen Concentration and Sensor Temperature.

MIL Status

• Check Engine Light ON

Note:

• AutoHex II is a professional Auto diagnostic.
• This fault code is a GERENRIC fault code, some cars may change the meaning of this fault code.
  To get the accurate fault code description you may use AutoHex II

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