The Brummie Mechanic

If I remember correctly it is a t55 but can't be certain..

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Long extension and a turbo reverse socket and a hammer. Possibly an impact driver will help too. Just hope the bolt doesn't snap! Then it's a strip down either way. Happy snapping!

Map sensor can't cope with the new power, clutch slipping, haldex engaging causing traction to kick in? Boost leak, vacuum leak etc etc. Was it a 180 to start with? If it's a 225 then it should have a 3bar map sensor standard. It's hard to understand why it has lost 35 bhp from standard. That's not age related, there is an underlying problem there. And the remappers would have picked up on sensor or running issues pre map.

Hi check the purple wire in the front door hinge wiring harness, that is the main communication wire for the door modules on that side. It's probably broken. Also while you are in there you may aswell check for splits in other wires and repair them too. Very common. The purple wire in question if memory serves me well is actually a purple wire with a black trace. Been a while but it is common. Lots of people misdiagnosed these with door module failure but I would always check the wiring first! Let us know how you get on and if the wiring is ok give us a shout and I'll guide you to what to test next.

Was it the thick brown wire?

Hi mate and welcome! Which spec a3 tdi do you have? Chris

They will fit yes but wiring for the electrics may be different. Although not sure. But bolt in would work. The airbag wiring should be standard though so your good to go.

As magnet said, check the wiring, usually the thicker wires tend to break first. Brown goes first If memory serves me well

Tell you what I'll do, I'll pull my concert out and take pics of the plugs to help identify your wires, I'll do it in the morning when I have some light ok? Mine is factory so won't have been messed with, all I have done is added a phone kit and used the CD changer input for an aux lead. But otherwise stock. Speak tomorrow.

Trained

Hi I would find the wiring to the egr and follow it through the loom back to the ecu and track for any shorts to power, seems like you have a chafed loom somewhere and the egr is getting too much voltage i.e from another power source along that loom. Easiest way to check is get a multimeter and set to volts. Unplug the egr, Black onto an earth point or battery negative and probe each pin until you find battery voltage or 5v reference. If either of these are an odd voltage like 8 or 9v when they should be 12v or 5v then you definitely have a short to power. If you find that you do, overlay a fresh wire from the correct coloured wire or pin on the ecu straight to the egr, just to prove the repair would work, run the car and see if it's cured and clear the codes. If all is well then back to tracing the chafed loom for a proper repair. Should do the trick, if not give me a shout! no problem.

Your front tweets usually take their power from the mids, not from the unit itself. That will be why you only have 2 pairs and not 4. I think there is a sticker on the concert that tells you what each wire does too?

I second that! Look through the wheels at the pads and see which pad is closest to wearing out and change that end of the car. Fronts I think carry the sensor on the b6 and b7

Hi mate welcome! what model engine etc are you after? Lots of people on here with q7, ask around for advice!