2004 Audi A4 Questions

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How difficult is it to replace? How much will it cost if i do it myself?
the stage on back window will not close
There was some dark fluid from under the car that came out, the the issues happened. However, windows and alarm started not working first. Car inconsistently skips when accelerating.
2 door convertible
Dear Sir/Madam,

What could be the cause of the power loss,jerking and cutting on an AUDI A4
The transmission was part of a class action lawsuit, but I had 110k miles on it and they stopped paying for fixing the trans at 100k miles.

The trans has been slipping for 3 years, I have always driven it carefully and it's hung in there all this time. Even drove from Arkansas to S. California.

I have smelled trans fluid when I park, the trans fluid has never been touched...? Could it need more oil?

Car has 139k miles, going to be giving it to my 16 year old daughter to drive...but I need to get this fixed.

Help. :-)

Mr. Fine
Upland, California.
Audi a4 sport 04 had bought car then 30 miles down Rd power just went what's the cause and how much to fix is this fixable
My car failed Smog inspection for small leak in EVAP system and system too lean bank 1, OBD2 code P0171!Please send response to e-mail address, thanks!
What is the type and size of the bolt that holds the crank position/speed sensor in place?
car was knoking.put it on machine it read some thing was rong with tentinoer i took cover off it ,timing belt and tensionner was lose
the sound is just when i brake either hard or smooth. When is really smooth it does not sound. However the sound is quite loud
I need to check my transmission fluid to see if I need some.
this is the error i have at the tester check ,and the question is if i can replace this senzor or i have to replace entire EGR or EGR valve ?
and a loud beeping noise came on as well
climate control set to 80, as engine warms up fan comes on and increases as engine gets hot, ice cold comes out, no heat.
last year audi in warick RI replaced radiator to fix this problem. been working fine till last week.
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