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Could be related to a faulty CCM under the passenger side carpet if it's got wet. Have you had a diagnostic check to see if any fault codes flag up? Could be an issue with the high pressure fuel pump. But linked to this if the ECU has got wet has this affected the immobiliser.

Excellent stuff glad it's sorted. Glad I could help you locate them.

If CNHA engine, it’s located on engine block cylinder head. Also known as hall sensor (14) on this link. https://www.lllparts.co.uk/catalogs/audi/RDW/A6/717/1/103/103052 Crankshaft sensor here too (15) near bell housing: https://www.lllparts.co.uk/catalogs/audi/RDW/A6/717/1/103/103050

Glad you found it 🙂 please keep us posted on how you get on

Hi, I had exact same fault with mine. My temp sensor wasn't reaching op temp of 90c, even after new stat fitted. I had a slight coolant loss which I traced to rear coolant sensor on back of head. Took old sensor to motor factors (so as to buy correct sensor) and was informed that my sensor wasn't the correct one. Apparently they are colour coded, my one was grey when it should have been black. Fitted new black sensor (supplied with strong metal spring clip and not cheap black plastic one) bled coolant system and took for test drive.....The difference was night and day. Smooth rapid pick up, no lag/flat spot and most importantly temp gauge reached 90c with 10/15 mins of driving. I now don't suffer from what people think is regenning, revs increasing to 1000rpm and cooling fans coming on. That was engine ecu being told engine was cold by incorrect sensor and was over fuelling to increase temperature. Check the colour of your rear sensor, it could be just that simple a fix. My sensor cost me £14.50 from Europarts....nearly snapped my index finger fitting the metal clip though....it has never run so smoothly and used the least amount of fuel if now does or doesn't !!!!

Thanks Steve, yes I've more than enough to keep myself busy!🙂 I'll mainly be after help with B5 info as to me that's a new car, but once I've learnt to navigate my way around hope to be able to contribute myself.

Morning @Chris Bird thanks for update was going to try the same thing as panoramic roof and water trickle from bonnet release. Checked plenum etc and all seems ok. Found this that might be helpful. As well as this thread https://www.vwaudiforum.co.uk/forum/showthread.php/189626-Panoramic-sunroof-leak Look forward to another update, will let u know how get on! Best of luck!

My word. Aren't you impatient. Learn some patience and wait a few days before demanding attention. We all have real lives outside the forum.