A4 diagnostic plug missing?
Junior Member
Joined: Sep 2009
Posts: 6
From: Boise, Idaho
it was under the steering column. i dont know why i have a port for one in the rear ash tray too though. theres nothing in there but i has the shape and the picture of the check engine light but nothing in there. luckily i found it and it was just a o2 sensor. got that fixed today
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