Andrew Helmus

So, as usual, the issue came back.. (ESP Fault, Parking Brake Malfunc., etc..) no issues with the key, however.

And this time I had a CEL.

Pulled the codes.. P0741 and P0175.

The first one (P0741) is related to the torque converter. This initially worried me, because I know that the seal in the torque converter is prone to failure, causing all kinds of transmission issues along the way. I don't need that headache right now.

The second code (P0175) is due to the system running rich, specifically in bank 2.

Now I should at that recently I have felt a bit of a vibration during idle, and I've also been experiencing a decrease in gas mileage. So, after some research on here, I found that the ignition coils may be to blame.

But what I also found (and this is the interesting part) is that the ignition coils can also trigger the ESP Fault, etc..

So I purchased 8 new coils on Amazon Prime for a cool $17ish a pop.

Next day, pop them in, clear codes, go for a drive, etc..

Voila! Problem resolved [again]. It's been two days with no issues, and I've already noticed an ever so slight increase in gas mileage. Also, I gained a bunch of power back, that I didn't even realize was missing. The car is like a missile now.

Also, both CEL codes that came up haven't come back. No codes at all!

So to anyone out there experiencing these faults and issues.. it might be worth checking your ignition coils!

In my case, I can't believe that I had the brake light switch AND coil(s) fail at the same time, when both can trigger the ESP Fault.

And also, I might be worth noting that the P0741 code could possible be related the the ignition coils as well.

mishar

You need full VCDS scan. It would give much more than just engine and transmission codes.

EHLO

That's BS, Audi even supplies the tool under the trunk lid to unlock the caliper;
https://www.audiworld.com/forums/a8-.../#post25032660

MP4.2+6.0

Transporter probably figured it out...about 5 ½ years ago... Seems to have left the building about 5 years ago. Or maybe he packed it it after the brake problem?

EHLO

Why would you think this would only be applicable to transporter2004?
Remember that people search this site year after year, and so we provide information that could help others later.

Garyknl

hi I had same on my A8 plus intermittent chime n headlamps inactive message
had rear drivers and speed sensor change n all well with car now. Cheap fix part only £35
hope this helps anyone with same issues

Garyknl

ABS speed sensor