2006 Audi A6 Quattro Questions

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Hi, I took out a fuse by mistake with the ignition on, climate control is completely dead and engine warning light came on, fuses ok, but climate control is still dead, i removed engine fault code with a diagnostic tool, but still reading: p1635
data bus powertrain: missing message from air conditioner control, any idea?
Audi A6 Quattro is pulling to the right and the steering wheel is shaking
I am planning to buy 2006,2007 or 2008 Audi A6 3.2 quatro and my question is -timing belt or chain and when is a time for replacement, what is tipicaly parts price and labor.
I let it run for about 15-20 mins then start driving. It will slowly get to normal temp. No leaks, antifreeze clean and at level. ? 79k miles on it.
We were told the bezel was replaced and only needed to program the climate control. The defrost is all that works. No heat. No AC. No way to control temperature.
looking into buying 2006 audi a6 3.2 quattro need to know cost of repair on replacement of belt or chain whichever applies
The anti-brake light comes on and off. Beeps frequently. Can it be repaired?
Tires and a month later they are saying that my transmission is out. Not sure if it is a good idea to put in a transmission. I put so much money into already? But I hate to lose all of the money I already put into the car.
No smoke from pipes, very slight fluctuation while driving, had problems with coolant leak last year that appears to be resolved-but sometimes the reservoir may go down and I'll just add a little more...
does synthetic motor oil break down? how often are oil changes required if using full synthetic oil in my audi a6 quartto?
MIL light staying On and car runs Very rough
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