Trouble?

[steamship]

Originally Posted by HPsauce

Any idea where that actually fits and how easy it is to swap?

It appears to be attached to the throttle body by two screws. The best picture of it I could get was here:

http://www.audiforums.com/forum/audi...5/#post1082894

Not sure how easy that will be, as no way to guage 'actual' position.

[The_Laird]

Well, by the time I left work, the ESP had gone off and the power was back to normal. The ABS, EMS and another (yellow triangle) light were still on though.

I called in to A4 Audi and got a diagnostic scan. It was the throttle position sensor and Andy cleared the other lights, which have stayed off.

He thinks that it's water getting into the switch/connector above the throttle peddle and, if I search my ageing memory, I seem to recall the same issue a couple of years ago. I'll need to get a closer look when I find the time.

[HPsauce]

So that's the pedal position sensor, not the throttle body sensor?

[The_Laird]

Yes, I think so

[Zip]

Originally Posted by The_Laird

Well, by the time I left work, the ESP had gone off and the power was back to normal. The ABS, EMS and another (yellow triangle) light were still on though.

I called in to A4 Audi and got a diagnostic scan. It was the throttle position sensor and Andy cleared the other lights, which have stayed off.

He thinks that it's water getting into the switch/connector above the throttle peddle and, if I search my ageing memory, I seem to recall the same issue a couple of years ago. I'll need to get a closer look when I find the time.

Yes - mine was the pedal position sensor - fits down above the pedal box...sorry for the confusion.

Z

[HPsauce]

Originally Posted by Zip

Yes - mine was the pedal position sensor

That's what I'm beginning to suspect on mine, how easy to fit and how much are they?

[steamship]

Originally Posted by HPsauce

That's what I'm beginning to suspect on mine, how easy to fit and how much are they?

It will require removing the lower dash trim under the steering wheel and I suspect also the air vent tunnel, so you can get access to the top of the pedal box. It's held in by two bolts (number 6 in the image).

After fitting, you then need to adjust it, and will need VCDS to do it. I've attached an image of the culprit and also the adjustment instructions.

The one on mine has the part number 028 907 475 BD ('01 3.7), diesel ones are BC, but can't confirm if all the petrol ones use the same part. Used one on eBay range from £46 (from A8parts) upwards.

[HPsauce]

Thanks, A8parts show the one they have (BD) as being compatible with a long list including S8.
I'll plug in VCDS and check the measuring blocks. I "thought" I'd done it before but I suspect I did the throttle body not the pedal.

[The_Laird]

Update on mine:

Car ran fine from Monday evening, through absolutely torrential rain and sleet on Tuesday and Wednesday and then, towards the end of my commute this morning, which wasn't that wet (and after sitting in my garage all night) same fault.

ABS, EPC and ESP lights on and no 'oomph'.

So, my current thinking is that it's not water ingress, but more likely the increasingly frequent, intermiitent fault on the sensor that Zip describes.

Planning to book it in to have this, cambelt (and ancillaries), brake fluid change and headlight washer done.

Gonna set myself up as a registered charity and/or remortgage the house and/or sell the kids into slavery!

[Bandycoot]

I was plagued with the very same problem recently. It took me months to sort it and as always I looked at the most expensive items first. I changed practically everything including the throttle position sensor and the throttle body. It turned out to be the fuel pressure regulator and a broken wire in the throttle body cable. The solution is sometimes not the most obvious.