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The ambient temp sensor is related to the AC function, if the HVAC system thinks the outside temp is too low, the AC will not be turned on. You probably have a defective temp. sensor. It is easy to change and relatively inexpensive. It is located on the underside of the top radiator support almost in the center (just to the drivers side of center). The car dying at a stop light can probably be solved by cleaning the throttle body. Make sure that both the front and rear sides of the throttle body are cleaned. And also disconnect the battery during the cleaning process, this will reset the computer and allow it to relearn to the cleaned throttle body. The compass issue is another separate issue and may just require a recalibration. I don't know what the procedure is but try Googling the subject.
I would check for a bad coolant temperature sensor, of a bad ambient air temp. sensor. You can check these with a good voltmeter, but a scanner would make things much easier. With the scanner, you can se what the computer thinks these sensors are telling it. If it's 20 outside and one of the sensors reads something like -10, there's the problem, but a five degree variation is not enough to make a difference.
the air sensor yur thinking of is usually found out front of the car on the post that supports the hood latch betwween the radiator assemblies and the oute decorative grill. go to your auto parts store like autozone and ask for the ambient air temp sensor. then if they can, ask for a diagram of its location. Its real easy to replace usually one bolt and one wire clip. Autozone has /offers these do it yourself repar guides that can help you .
Have you used the handy search feature? You would find that this is likely caused by one of 2 things. First, the ambient air temperature sensor may have gone bad. Secondly, wiring from the sensor to the mirror may have gone bad. Either way, you would get OC (which stands for OPEN CIRCUIT).
Found this solution on: http://forums.trailvoy.com/showthread.php?t=54333KQ3SYK
The ambient temperature sensor going bad causes this exact problem. I've replaced many of them because when they show outside temp as being below 60 degrees, the A/C control module will shut the compressor off.
Coolant temp? Oil temp? Outside (ambient) air temp? Which sensor is the problem, and what year/engine is your A6? Can you give some specifics on what is going on that are leading you to feel that a temperature sensor is going bad?