Originally Posted by leftos

This happened to me on the highway Saturday night. Noticed the light come on but since I was going a steady 70 I didn't notice any loss of power until I was on the off-ramp. Then the car really started to struggle, so I drove it gently to my place 1 minute away. I kind of regret not pulling to the side on that off-ramp and turning it off right there and then, but it was really late, and I didn't want to be stranded on the side of the road in the middle of the night what with my place being so close.

Turned it off, turned it back on, no EPC light, no issues. I've been driving it ever since with no issue, so my experience has been identical to everyone else's. Audi Marin's first available service appointment when I called them Monday morning was Friday morning (this upcoming Friday), but I did ask to talk to a mechanic after booking the appointment. The mechanic told me that they haven't had an S3 come in with that issue yet, but he didn't dismiss any of my claims when I mentioned the TSB from Audi. He said I should bring it in so that they can look at the codes the car has stored, and that if I was worried about being stranded I could do an emergency drop-off any day before Friday even. Given everyone else's experience, I thanked him and just opted to drive in on Friday, since they also have a loaner reserved for me on that day.

Again, the car has been running absolutely fine before the EPC light came on and ever since that ignition cycle. Bought it early July from Audi Concord with 200 miles on it (which felt a bit high, but it was the color and exact package combo I wanted for a good price), and it's now at 1600 miles, with the first 1000 being a gentle break-in (and a lot of less gentle and more fun driving since). The car has been exhibiting no other issues, and I love it.

Now, I'm taking it in Friday morning, and I'll make sure to mention the TSB again, trying not to be annoying about it. I just don't want to take the car back with them saying "we found nothing wrong so we did nothing" or "we replaced a bunch of parts just in case". So we'll see, I'll keep you guys posted once I have the car back.

Is there a reason to report this to AOA too, or is my local dealership enough?

Originally Posted by scoopman

You should report to AoA to make sure there's a record in case of a need for warranty down the road.

Re your dealer, tell them to not waste your time and just flash your car with TSB 2041261/1 dated July 24. It specifically addresses the EPC loss of power issue, your exact symptoms.