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If you see the check engine light come on in your BMW, it's a good idea to use an OBD II scan tool to figure out what's going on. One common code like 51AD could signal a communication issue with the transmission. This could indicate problems with the wiring, a sensor, or even the gears themselves. Start by checking the wiring and connections around the sensors on the outside of the transmission to ensure they are secure and in good condition.
In a BMW, if you see Code 51AD popping up, that indicates a problem with the transmission.
The text "51ad" is not clear and seems to be a typo or an error. If you can provide more context or information, I would be happy to try to help you interpret or understand it better.