Probably caused by the electronic throttle control . How many miles on the vehicle ? The gas pedal has position sensors that the PCM - engine computer uses to know how much to open the throttle plate . Drive by Wire Function and diagnostics by Wells
What engine ?
The throttle actuator control (TAC) system is used to improve emissions, fuel economy, and driveability. The TAC system eliminates the mechanical link between the accelerator pedal and the throttle plate. The TAC system eliminates the need for a cruise control module and idle air control motor. The following is a list of TAC system components:
• The accelerator pedal assembly includes the following components:
- The accelerator pedal
- The accelerator pedal position (APP) sensor 1
- The APP sensor 2
• The throttle body assembly includes the following components:
- The throttle position (TP) sensor 1
- The TP sensor 2
- The throttle actuator motor
- The throttle plate
• The engine control module (ECM)
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First you need to have EBCM - electronic brake control module check for DTC'S - diagnostic trouble code's . If the light is on there is a code stored . I think most part stores can do this and for free . After you find out what code is stored , looking up that code in service repair information for diagnostic trouble shooting chart would be next step . There are a few codes too.
DTC C0035 or C0040
DTC C0045 or C0050
DTC C0241 or P0856
DTC C0244 or P1689
DTC C0290 or C0292
Find the code do the diagnostic's , fix the problem , wiring issue's , a sensor , bad module ,what ever it is . The light will go out then . Here is a sample of code discription .
• DTC C0035 Left Front Wheel Speed Sensor Circuit
• DTC C0040 Right Front Wheel Speed Sensor Circuit
The lights will illuminate for two seconds when the ignition is turned to the on position
The lights will turn on and then off when the engine is started
The lights may come on and stay lit after the engine has started then turns off when the vehicle reaches about 25 mph / 40 kph
The lights may come on during driving but then turn immediately off. - - However, do not hesitate having the computer codes and system checked by your Subaru specialist. Good luck.
I would suspect a problem with the throttle actuator. It is located under the hood and the air hose from the air filter box attaches to it. You can try removing the air inlet hose and cleaning the valve with carb cleaner. Resetting the codes may make the vehicle run well again but usually the problem will reoccur and the throttle assembly will have to be replaced
You would need a scaner to pull data out of your computer, go into the A.B.S. mode scroll to wheel speed sensor, while some one drives the car for you, check MPH on front and rear wheels sensor, the one that show 0 MPH is the bad sensor. Replace and recheck, Also check harnness first.