How do I get a 1992 Audi Quattro 100 out of 2nd gear limp mode

This could be stuck in what is sometimes called "limp Home Mode"
I have found a common problem is the earth wire from body to engine has stopped making a good contact so take lead off and make sure both ends are clean from dirt oil etc and make a good connection on surfaces with a wire brush or sand paper and reattach
Good Luck :)

Sounds like it's in Limp Mode.
Does the dash gear display flash, or is it highlighted different to normal?
In Limp mode it will run in 3rd gear only in an attempt to minimise any damage.
You need to get it to a transmission specialist straight away.
May be as simple as low fluid, but you need to find out.

limp mode is when the ECM reduces power in the engine to prevent damage to the engine and gear box. It allows you to get the car to a position of safety to check items like oil and coolant levels and temperature .Run fault codes to find the cause of the limp mode

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.

outside the tranny

Audi A4 1.8 quattro 1997 automatic transmission does not change gears sometimes. It revs very high but the gear seems to be put in neutral

check your inhibitors switch or the shifting cable.

how too check transmission fluid on audi 100s 1994

Hi I also have an Audi Auto 2.8 non quottro had a simler problom and it turneed out to be one of the gear relays that are under the stering wheel on a left ****** that is.

Check out these 2 websites, eautorepair and alldata, you register your car and pay for access to manual info for a time period u set (eautorepair 1week to 1 year, $11.99- $29.99, u can print any info off your computer). Let me know if u can't find your vehicles info.