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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 05-01-2015, 09:06 PM   #1
Ken Richter
Registered User
Join Date: Jun 2003
Location: Santa Rosa,CA
Posts: 6
My Ride: 1999 328i
Caution: Data Link Connector

Took my 1999 E46 328i in for a routine smog check. The technician said that he was unable to connect my OBD-2 to the CA smog data base. Thought I might have a computer malfunction.


Next stop was to my local independent BMW shop (Bavarian Tuning, Santa Rosa) and he offered to look at it. He found that the Data Link Connector (DLC) was not making a good connection and this was my problem. No charge. Have a good day!

Went back to the smog station and passed with flying colors.

I apparently was sloppy at my last oil change when I reset the oil service light with my Peak tool and did not securely tighten the cap on the DLC.

Lesson learned.
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