DTC P2251 Acura
Rear Air Fuel Ratio (A F) Sensor (Bank 1, Sensor 1) VS Circuit High Voltage
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 and Solution
Poor connections or loose terminals at the A F sensor (Sensor 1) and the PCM
Open 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 software
Video Guide
Diagnostic Info
- DTC Code: P2251
- Brand: Acura