EPC light
 

Hello gang, I have received my S4. It's been about 7 weeks and I've done the usual break in for the first 1K (600miles). Started moving it more and more. Employing DSG and manual mode. I also have the sport diff.

Now 2800K. I have had 2 instances of EPC light coming on specifically in manual mode with subsequent misfire of cylinders. Restart brought engine back to all 6 cylinders but EPC light on. After parked for a day EPC light off. Took it in first time - ODB called it 'sporadic' misfire. No problems for a week. Took it on a 1K highway trip. No issues. Back in the city - manual mode - same thing. Car in shop - same codes - sporadic misfire - 2 cylinder heads down (1 on either side).

Of note - the Engine light never came on. What does anyone think? Of course I am concerned this is happening in a new car...Thanks for your input.

call your service advisor and report this. Post your VAG codes (complete VAG listing) if you have them.

By complete VAG listing, I mean something like this:

Sunday,02,March,2008,14:46:37:16665
VAG-COM Version: Release 704.1

Address 01: Engine
Control Module Part Number: 8D0 907 551 M
Component and/or Version: ASP / POWER G01
Software Coding: 06711
Work Shop Code: WSC 63351
5 Faults Found:

16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16685 - Cylinder 1: Misfire Detected
P0301 - 35-00 - -
16688 - Cylinder 4: Misfire Detected
P0304 - 35-00 - -
16690 - Cylinder 6: Misfire Detected
P0306 - 35-00 - -
16689 - Cylinder 5: Misfire Detected
P0305 - 35-00 - -

Readiness: 0010 0000

Bruce

Someone PLEASE tell me that Audi (VAG) isn't still having issues with their coil packs!

Thanks Bruce - Car in shop...still. (>24h). I am told there is a software update that needs to be installed. They are now in touch with Audi technical (national level) and this is what they have recommended. I guess we will see.

I will ask them to produce the VAG codes and post them.

Cheers-

good luck man! post your status when you can.

Bruce

4 Faults Detected

6355 P030600 [32]
Cyl 6
Misfire Detected
Sporadic

6350 P030100 [32]
Cyl 1
Misfire Detected
Sporadic



6371 P030000 [32]
Random/Multiple Cylinder Misfire
Detected
Sporadic

7948 P130A00
Cylinder Suppression
Sporadic

What do you think?

So It's happened three times. 1100km/2100km/3000km. Regardless to say - it has been a very frustrating and disappointing experience. I'm driving a rental - not the way I imagined new S4 ownership to be.

It was on the COM with AudiCanada and AudiAG. Of course the event could not be re-simulated. But on all three occasions Cylinder 6 seems to be the initial location of the misfire. It was noted that there were over 200 misfires in the intervening 1000km and I was told that that is not uncommon as they go unnoticed.

They opened the cylinder heads and examined the culprit cylinders with a BORA scope (fancy fiberoptic scope. They noted some very faint residue on the piezo fuel injectors. So they are going to replace these two injectors and see where we go from here. Apparently this was a early problem on the Q7.

I am told that N. American fuel (compared to European) is permitted to contain a higher percentage of 'filler' despite going for Top Tier Audi recommended fuel which is what I have always done (Shell V-Power for me). Hence several carbon threads on the german car forums. So we will see what happens next. I remain the pessimist...

Let sadness prevail. So they replaced two injectors. 200km later EPC and now Check Engine Light on!! Sigh...This will be the 5th visit in 3months to the dealership.

Holy crap. That really sucks. Sorry for your troubles. Isn't this cause for "lemon"ing the car? 5 visits for the same issue?!?!?!

No Lemon law where I live. This IS absolutely crazy - I keep searching for common threads with this forum and others and clearly it's not happening frequently at all! I am trying the proper channels through corporate audi for a vehicle substitution but they're not biting.

This is not worth my time - I am going to probably trade-in. But I'm very very nervous about getting another S4.....I'm looking elsewhere now and there aren't any good alternatives...

The other sad part is I put full PPF over the bumper/full hood/full fender/the works + ceramic tint thinking this would be an investment in a long term ownership - 2K worth...it's only money I guess....just a lot of work :(