Volkswagen automobiles developed immediately after 1996 are outfitted having a method of sensors regarded as On Board Diagnostics (OBD II). These sensors keep track of numerous essential engine functions and aid to reduce harmful emissions. When one of these sensors fails it sends a signal on the engine personal computer to illuminate the "Check out Engine" light in the dash. To clear this light you will need a diagnostic code scanner. Scanners range in price from $40 to $120 and are available at most auto parts stores. Other People Are Reading Ways to Reset the Test Engine Light The way to Reset the Service Light on a Volkswagen Passat Things You'll Need Diagnostic code scanner Show More Instructions 1
Connect the diagnostic code scanner to your vehicle's diagnostic port. The port will be located in the dash below the heater controls.
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Turn the key to the "Run" position, but do not start the engine.
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Press the button on the scanner that reads "Scan for trouble codes."
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Wait for the scanner to finish scanning the engine's laptop or computer.
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Press the button on the scanner labeled "Clear all trouble codes."
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Disconnect the diagnostic code scanner from the vehicle.