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Acura DTC

Acura DTC P2243

Manufacture

Acura DTC

Code

P2243

Definition

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

Description

With engine running the VSB1 terminal voltage repeatedly fluctuates from a value above 4.8 volts to a value below 3.4 volts, at least 150 times. The execution time is continuous and DTCs P0135, P2195, P2237, P2238, P2245, P2251, P2252, P2627, P2628 are not active. NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot.

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 needs to be updated with the latest softwareFaulty PCM

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