Coil and ESP lights - p0726 fault

[TripppA3]

Hi. I'm new to the forum and newish (bought November 2020) to my Audi A3 (manual, 2.0 tdi) (2007).  Its been well looked after, well maintained, treated like gold by the previous owner and I've kept it serviced etc and had no issues. Until now 😞 

 

Whilst driving a few weeks back, the coil warning light started flashing and the ESP light came on. The car carried on driving, but idling seemed a bit off. I wasn't far from home so drove back and it stalled as I was parking, the the engine management light came on.

 

At this point it became difficult to start, and even harder to drive. I checked the OBD fault code and got P0726 which indicated a speed sensor issue. The garage recommended clearing the fault, but it all happened again within 10 minutes of driving so dropped it off with them.

 

They have checked for "usual suspect loose wire" but that checked out OK. They replaced the crankshaft sensor, issue remained. They replaced the Cam sensor, and that didn't work either.

 

The garage has basically given up as their electrician is only part time and ready to retire lol. I've seen suggestions on some forums to try repalcing the brake switch for the lights I've described but nobody connects that that with the fault code. 

 

Does anyone have any similar experience. Hoping this isn't either fatal or too expensive....

 

Many thanks 😊 

Edited April 1, 2022 by TripppA3

[cliffcoggin]

Jon.

The first thing to emphasise is to not take the error code literally. Cheap code readers are known to give misleading results, so unless yours is a professional quality reader it can not be relied upon. It is not a field I am knowledgeable about so I suggest you wait for a more informed response here or take the car to a garage that has a good auto electrician.

The second point to make is to not replace parts at random like your garage has done. Just because another person solved a similar sounding problem with a new brake light switch does not mean his solution will work for you. You might strike lucky, but more likely is that you will throw good money after bad.

[Jbarfield]

Hi TripppA3,

 

did you ever find out what the problem is?

as I have the exact fault you’ve described on my 07 Audi A3, any help would be appreciated 

 

kind regards 

Jack 

[TripppA3]

1 hour ago, Jbarfield said:

Hi TripppA3,

 

did you ever find out what the problem is?

as I have the exact fault you’ve described on my 07 Audi A3, any help would be appreciated 

 

kind regards 

Jack 

Hi Jack

So there was more to the story which has disappeared from this thread. I took the car to another garage with better diagnostics etc, a German car specialist. They replaced the crankshaft sensor again and advised what my garage had installed was a cheap copy and useless, they also replaced the glow plugs.

Car ran fine until a week ago, new set of symptoms and different codes etc but drivable for now.

Hope you get it sorted 👍 

Cheers

Jon