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Originally Posted by brasiliangringo
If you cant start it a CPS might be at fault agreed, but they dont often show a code. I had a situation with a 2008 A8 TDI and when hot mainly it wouldnt start and new CPS sorted it - took much head scratching and injector testing etc. Cant recall where they are on the S8 but they are usually easy to replace and not expensive and whilst i hate throwing parts at cars to fix a problem without diagnosing 1st, sometimes its a more economical use of time / money and the only option.
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I have downloaded the G40/163 sensor replacement procedure from the Service Manuals uploaded (by Delboy?) - thanks for that resource  . They are at the camshaft ends - one at the front of Bank 1 and the other at the rear of bank 2. The latter is easy to get off but the one at the front requires bumper and fan removal  . You are right - they come in at around £13 on ebay.
Anyway just replaced the fuel filter (needed doing anyway) and there was plenty of pressure behind it. Next - check the earthing connection but now need to dry off and change clothes as its chuckd it down with hail, rain and snow whilst i was doing tthe filter.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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