P0AC8 Subaru B11 OBD Code

OBD/2 P0AC8 error code description and symptoms.

HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw.
The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S. Water in harness connector. Open VPWR circuit. Open GND circuit. Low battery voltage. Corrosion or poor mating terminals and wiring Damaged HO2S heater. Damaged PCM.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

P0AC8 Subaru B11 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine P0AC8 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If air bag internal diagnostic monitor fault or system disarm fault so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the air bag internal diagnostic monitor fault or system disarm fault.

Common Causes of Subaru B11 P0AC8 OBD2 Code

A common cause of code P0AC8 is the failure of Air Bag Internal Diagnostic Monitor Fault or System Disarm Fault, but there are several other possible causes as well, such as ;

Exhaust tube
Engine Control Module (ECM)
Ignition coils circuit poor electrical connection
Faulty Fuel injector

P0AC8 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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P0AC8 Subaru B11 OBD Code

P0AC8 Subaru B11 Error Code Repair Process :

Common Causes of Subaru B11 P0AC8 OBD2 Code

P0AC8 code for other Subaru cars