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How you can Diagnose a Subaru 1Open the driver's side door and sit inside the driver's seat. Locate the scanner junction panel underneath the steering wheel. Open the panel and connect the OBDII scanner tool for the junction.2Insert the Subaru vehicle keys into the ignition switch. Turn it to the "On" position but do not start the engine. auto diagnostic

Let the OBDII scanner communicate with all the car's onboard computer system and study codes stored inside the memory. Look at the scanner because it displays the codes picked up. Write down the code numbers on a notepad using a pen Vehicle Diagnostic equipment, even if the scanner tells you what the code stands for -- you'll require it later to describe to a mechanic.3Turn the automobile ignition back for the "Off" position and eliminate the car or truck keys from the Subaru. Connect towards the Web using a laptop and look up the codes you wrote down in case your scanner does not describe them in detail.

Write down the descriptions on your notepad.4Reconnect the scanner towards the Subaru and turn the vehicle towards the "On" position again. Direct the scanner to wipe the current codes inside the auto. Turn the auto "Off" and eliminate the scanner. Turn on the car and its engine and drive it around to try and get the car to turn on its examine engine light again. Repeat the code reading course of action on the Subaru to confirm the exact same codes are being signaled by the engine sensors plus the first time was not a blip. Take the car or truck to a mechanic together with your confirmed information and direct the shop to make the required repairs.