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Audi A6 Quattro Questions

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We drove the car to the store came out 20 minutes later and the car wouldn't start. We left it and came back a few hours later and it started right up. It kept doing this throughout the week so we took it to the shop where they said we needed to replace the battery so we had them put a brand new one in. The battery indicator on the dashboard read just under 12 so it looked like everything was good. It worked for 2 weeks and now is doing the same thing with the starting sometimes and then not starting and once we even had the car running while loading it up for a move and it shut itself off with the battery indicator showing no battery power at all (it had been running for about 5-10 minutes), now is just clicks, trying to turn over we can't get it to start at all. We are trying to figure out what exactly is going on because the new battery did not work.
i am looking for a mechanic in my area(11421) that will fix the head gasket for the price shown on repairpal..

My inner lights, windows won't go up or done and sunroof don't work. I checked all my fuses, I don't know what it is, what could be wrong with it how do I check it and how much will it costs to get it fixed?
we have what seems to be a pressure leak near the heater
my audi was running just fine and i was out of town for the week end and i went to drive it and it wouldnt start it makes 2 very low clicking noises and i go to start it and the engine turns but dont start i checked fuses and it has a full tank of gas primum and well i cant get it started what could it be i also bought a new battery please help what can i do
my car overheats after 10 minutes whether idling or driving.
this all started after a flood 2 months ago, overheated once then and then; first drive after car finally restarted. last week it started overheating every time I try to drive it.
engine light come on and codes read (1)bad catalytic converter bank 2 below threshold and (2) cylinder 1 misfire
and other devices work as designed.
I drive an Audi A6 Quattro 187k+ miles and was told the control arm bushing needs replacement & is causing the wheel alignment issue. The replacement is very costly and I was wondering if tire rotation every 3k miles can delay the replacement? What can happen if I delay replacement in addition to uneven wear and tear of tires?
MY INSTRUMENT PANEL IS SHOT SO I CAN'T READ THE CODE. THOUGHT LOW TIRE PRESSURE SINCE ONLY HAPPENS WITH A LEFT TURN, BUT NOT THE CASE. SEEMS TO ONLY DO THIS WITH A SHARP LEFT, LIKE FROM A STOP OR GOING AROUND A VERY SHARP CURVE.
Simply changing bulb in dome light and something blew. No power windows, roof or interior lights. display shows three doors open. What the heck?
my 99 Audi a6 Quattro Avant overheats and when I turn on heat blower temperature gauge go back close to normal.
It tends to show full even when half empty, sometimes going up and down from say 3/4 to full, when the tank is 2/3 empty, judging from the distance done since refuelling.
problem is constant for the last week.

Will it cost a lot to repair?
daughter added wrong type of oil. is there another oil pump that can be used on this car.
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