An ignition coil or spark plug may fail unexpectedly resulting in an engine misfire and possible illumination of the Check Engine Light. Vehicles equipped with spark plug wires may also develop a misfire caused by a failed spark plug wire.Google+
Car Problem Reports
Audi A4 Quattro Ignition Coil, Ignition Wires, and Spark Plugs May Fail
Audi A4 Quattro Problem
Average Mileage: 79,500 mi (53,000 mi - 115,000 mi)
There was a sudden loss of power and the engine light was blinking continuously. I was unable to reach 40 mph's and there was smoke coming out of the hood. Had to get the car towed to my mechanic to get #2 Coil Pack repaired, spark plugs and valve gasket cover replaced (oil was leaking). I called Audi corporate and notified that this is an issue and advised there was a nationwide recall. I made an appointment the following day at the Audi dealership and they replaced all 4 coil packs including the one I had replaced for free. I sent in my bill to Audi Corporate to get my repair bill from my local reimbursed. They said it will take about 90 days. Lets see if they pay me back but nothing can replace the fear of your car losing power driving on the highway during rush hour traffic.
Visitor, 2003 Audi A4 Quattro, 53,000 mi
Visitor, 1999 Audi A4 Quattro, 115,000 mi
I have a 99 A4 Quatro with the 6 cylinder engine. My check engine light went on and the car drove real roughly so I asked a local muffler/repair shop to scan the codes. They got a code incicating an ignition problem but electrical repairs are not their forte so they suggested I take it to the dealer or a specialty shop. I had them go ahead and replace the coil pack as I everything I read on the internet led me to believe this was a common problem. No go! $400 later, another shop found it was simply a spark plug wire. Lesson learned; start with the simpler, cheaper solutions.
Had ignition coils go out on me twice already.