Audi tt 180 quattro car wont start. EPC and E-M system lights on

More than likely the stater motor is knackered,but if it's a manual drive you should be able to push start,in second gear.

I assume not cranking? Or cranking, but not starting?
No other work done while battery disconnected?

What is the fuel quality? If you had gasoline with ethanol additive sitting in the tank for months, it will be very difficult to get it to burn at a fast enough rate to run the engine. Broken-down gasoline is straw-yellow in color and does not have as strong an odor as fresh gasoline. It may also contain solid sediments that can clog carburetors or fuel injectors.
If your fuel is degraded, change the fuel filter, drain the tank, and try again with fresh fuel. A quick test for this condition is to spray starter fluid or WD-40 into the throttle body. If the engine starts quickly, then runs poorly or dies when the starter fluid is exhausted, your problem is bad fuel.

if vechicle getting spark and fuel.timing could be off due to a worn timing belt.i would do a compression test see what condition the engine is in.

The yellow light oil sensor on Audi TT Quattro is the warning message for the minimum oil level has been reached !!!
Check engine oil level by dipstick & fill up oil inside engine !!!

i have audi tt 2000.when i was driving on highway today my car stop suddenly and EPC light was on,also check engine light was on..what s the problem on my car?

i believe thats a tune up issue- plugs wires

You will need a scan tool, or just drive the car and if it was due to battery once the computer finishes running its diagnose checks it will turn light off, this may take a week and some driving around. you could also have the computer scanned to see what code is stored and see if its due to the battery.

your crankshaft positon sensor is defective. Replace it and the epc will never come back and no more dying out. this happened to me several times and it would just come and go. i replaced it and now the car starts right away and the epc light hasnt returned since

Faulty batteries are rare. Typically when battery won't stay charged an alternator is needed, but you can check for a current drain first. To do this you need an ammeter. Disconnect positive line of battery and connect the circuit "through" the ammeter instead. (DO NOT START THE CAR LIKE THIS!!!). Monitor current draw - as you do so, pull each fuse from fuse panel (left side of dash). Don't pull them all, but rather remove one at a time. When the ammeter shows minimal current drain you'll know which circuit is causing the draw. You can then disconnect individual loads on that curcuit until you find the culprit. Hopefully it's something easy like a light switch - but it could be more involved.