How you can Test 4Matic Diagnostics 1Locate the OBD (onboard diagnostics) port in your Mercedes by referencing the owner's manual. Generally, the ODB port is situated underneath the steering wheel.
2Insert the plug coming out of your code reader tool into the OBD port, then turn your Mercedes' ignition for the " ;Accessories" position in order that the stereo and associated electronics are activated.3Allow the code scanner to automatically scan for any codes which will be outputted when the car's electronics system is activated.
4Take note in the codes that happen to be displayed on the screen of one's code reader as you will need to reference this list.5Contact your Mercedes Benz dealer or an authorized mechanic and request a translation from the error codes. Alternatively, many auto parts shops carry books in-house which will enable you to establish what the codes imply and which parts of one's 4Matic technique are failing .
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