Check your ignition coils. I had the same problem on my 2002 Audi a6 3.0 quatro. Tiptronic transmission. I was driving down the road and all if the sudden the car started vibrating violently to. I thought I had a flat tire so I pulled over and checked but there was no flat tire. The more I accelerated the more it would vibrat. Changed my ignition coils and the problem went away.
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Re: 1999 AUDI A6 avant 2.8L quattro. Car vibrates
This is a manual transmission? If so the clutch probably needs to be replaced. When you say "VIOLENTLY" what is going on, what is the road speed, what are the RPMs at? The more specific information the better. And this problem ONLY occurs between gear changes, right? The other times, everything is normal?
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16619 -Engine boost condition - Limit not reached. Check intake hoses/ connections for leaks. Check Turbo charger waste gate regulating valve/ waste gate working correctly. Must move freely when accelerating, won't achieve full boost if waste gate sticking open. Check Turbo impeller turning freely, oil feed pipe for turbo can get blocked causing impeller to seize. Engine compact, not easy to access these components.
Radio lock out codes are security related and where
supplied with the original paper work when the car was delivered to the
original owner to discourage theft, so they are not published on the web, if they were what would be the point? Any thief could get the code
after stealing your radio.
Contact the dealer for instructions and what
info u need to get your cars unique radio code. The dealer will require
the serial number off the radio and proof of ownership of the car it