Hello i have a b5 1.8 t and i just drove it home from work and everything seemed fine..then realizing i had to run back out for drinks and the motor cranks but doesnt fire up.. Epc light is on when i turn the key along with all the other lights. Can someone help me out please?? What could it be?

 

well i let it sit for awhile and got back in it and it started right up, drove it to the store and back...turned it off and back on again and its normal. thats freakin weird. any suggestions?

 

Only way you'll know what's going on there is with some VAG-COM codes. Anything else is just an expensive guess.

 

I'm having that same problem right now. every things new in my car engine as well. my 01 audi s4 stage 3 one day was making a grinding noise near back of engine when i started. tuned it off and realized it was my flex plate. the rivets had broken so the plate would just spin but no torque. i fixed that issue and now my car cranks but no start. i have a apr stage 3 chip and i have my edu unlock code to unlock the anti theft on it. i get the same two codes every time i go start the car. it cranks and cranks but just won't start. i have fuel. my icm are new and so are my coil packs and spark plugs which are gaped at .25. i have done every test i can do and checked all fuses and done timing 5 times. and i get weak spark to cylinders 1,2,4,5. 3 and 6 have a bright white spark. i have used my edu from my other s4 i have and swapped all my new parts and spark plugs to my other car and i get no codes and runs really well. so i put all my stuff back on my problematic s4 and still no start. cranks but no start. it kills me cause i fix Audi"s and VW's and I've have never come across a stuburn car like this s4. all others its usually the cps or a coil pack or spark plugs or icm or a week starter or a bad battery. i have done a compression test and its just like new pressure minus 10 all even. did dry and wet compression and good as well.
I'm getting codes
16730 - camshaft position sensor (g163)
P0346 - 35-00 - implausible signal
16725 - camshaft position sensor (G40)
P0341 - 35- 00-implausible signal
those are my only two codes. please help.