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Message: <blockquote data-quote="gimli" data-source="post: 705272" data-attributes="member: 942">i have changed batteries a couple of times and I have never had to "register" the battery before! unless you get any errors, then you need someone with a diagnostic machine to reset the error. if not, whats the point?the only thing you need to do is make sure the key is not in the ignition, the driver door is open and the wheels are straight (if the wheels are not straight it might set off the active steering). if the active steering error does show uo, turn the steering fully left, and then right. Restart the car and 99% of the time it will go off. Its really not that difficult.For 320i e90 din88 or even din66 should be sufficient. Try to get branded (bosch, century, etc)</blockquote>