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Acura DTC

Acura DTC P2251

Manufacture

Acura DTC

Code

P2251

Definition

Rear Air Fuel Ratio (A F) Sensor (Bank 1, Sensor 1) VS Circuit High Voltage

Description

With engine running the VSB1 terminal voltage is 6 V or more, and the PCM internal signal voltage is 4.6 V or more, for at least 5 seconds. The execution time is continuous and DTCs P0135, P2195, P2237, P2238, P2243, P2245, P2252, P2627, P2628 are not active. NOTE: If DTC P2251 is stored at the same time as DTC P0134, troubleshoot DTC P2251 first, then recheck for P0134.

Cause

  • Poor connections or loose terminals at the A F sensor (Sensor 1) and the PCMOpen circuit between the PCM and the A F sensor (Sensor 1)Faulty A F sensor (Sensor 1)PCM may need to be updated with the latest softwareFaulty PCM

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