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hmmmm diagnoltistics communists eh? :idea2 nope no clue
 

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its hard to find by looking at pictures, and i dont have a e46 to look through myself but the cap should look something like this:

i think on the e36 328i it was in the top left of the engine bay, but bmw mightve moved it
 

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The nav. unit itself is well over 1200 bucks, then you have the processor, the antenna, trim pieces etc., all the while hoping that your car is wired for the nav. system. Probably at least $2500 + in parts alone. It just depends. Have a dealer look at it and quote it. they shouldn't charge you a dime.
 
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