Well i am replacing my old Dizzy on my A6 in hopes that it will get rid of my code 4 problem... Any other suggestions while im at it...

 

so i guess that will do it

 

the best way is to test resistance between d & c terminal on teh connector. if it is between 350-550 ohms then you are ok there so move on to the ground on c & d sperately & if you get resistance that is in teh same range then check teh actual wiring harness. If that is fine then replace dizzy, and/or try another ecu.