ok I have this problem, there seems to be no power to the IAT, MAF, N75, N108 and they apparently share a common power feed, red and white, that also goes to the radiator fan relay, but my tdi redeye has a mechanical engine driven fan, the engine was replaced a by the previous owner, any ideas guys? Getting codes for all of the above, no boost at all, and flashing glowplug lamp at certain times which goes away then returns later.
Also has codes for brake pedal status monitor, but when the glowplug light flashes, pressing the brakes makes the flashing symbol disappear immediately......