Acura DTC

Acura DTC P0155


Acura DTC




Front Air Fuel Ratio (A F) Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction


The execution time is continuous and the duration time is 2 seconds or more. Engine running and battery voltage at 10 volts or more. One of these 2 conditions must be met for at least 2 seconds: (1) No return signal HIGH is detected when the PCM output duty is less than 20%. (2) Return signal does not change when the PCM output duty is more than 20% and less than 80%. NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot.


  • Poor connections or loose terminals at the A F sensor (Sensor 1), the relay and the PCMOpen or Short Circuit between the A F sensors, the relay or PCMFaulty (A F) Sensor (Bank 2, Sensor 1)Faulty PCM

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