Question about 2005 Audi S4

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Ignition coils on 2005 Audi S4 cabriolet

I had a tune up on my 2005 Audi S4 Cabriolet. The ignition coils were not replaced as part of the original tune up, but the valve covers were removed and new gaskets were installed. The car has 50,000 miles. When I drove away, many of the cyliners stopped working (apparently 4 or 5 of the ignition coils stopped working) after 5 blocks.

A problem occured because the mechanic could not spend time to troubleshoot that day and sent me on my way home. On the way home (traveling for 10 miles at 50 mph) on a few cylinders, a fire started below the passenger compartment. I was rescued by farmer with fire extinguisher. The mechanic said raw fuel was sent out the exhaust and catylitic converter must have been so hot insulation below passenger compartment caught fire.

It seems odd that this happened after the work I had done on it. Could mechanic have caused the ignition coils to be effected. It required 8 new coils and 2 O2 sensors, a new shifter which also melted.

Any thoughts you may have to explain these events would help.

Thanks, Bob

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  • Anonymous Jan 14, 2009

    same problem.fix all coils and the car still not have a good idle 2004 audi s4

  • VinF Apr 07, 2009

    Same issue, I had noticed a slight oil leak, so I brought the car (2004 S4 Cabrio, 50,000 miles) into the dealer, they ended up changing the valve covers gaskets. Still had a small oil leak, brought it back to the dealer and now they decided to change the cam seal and the valve cover gaskets once again. While the car was still at the dealer, one of the coils went bad. When I picked the car up, no longer than 5 miles from the dealer, the second coil went bad. Went back to the dealer and had the bad coil changed. I asked if this would happen again, they said they couldn't tell. The following day in my driveway, the third coil went bad. Three coils in 3 days. The engine light was flashing each time, I understand that you shouldn't drive the car when it's flashing, too much fuel in cylinders not being used, could realy mess things up. Had it flatbeded to the dealer, they would only change the coil that went bad, I decided to have the remainder of the coils changed at my cost. I've been told, if one of the coils go bad, odds are they will all start going bad, best to change them all. Good luck.



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If you replaced the coils the spark plugs should also be change. The plugs are more than likely bad.

Posted on Jan 29, 2009


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