So this has been quite a long standing problem I have had on my 3.0TDI, but it has recently become undrivable! When under load (used to be full throttle now it is most of the time) I get a flashing coil light. If I do a scan, the fault I get is “Fuel Pressure Regulation Control limit exceeded Upper limit exceeded”. I have already replaced the high fuel pressure sensor on the LH rail and the high fuel pressure regulator on the RH rail.

I know there is a flow metering valve on the back of the HPFP, so this is going to be my next target as it is the only thing left that hasn’t been replaced. This is getting expensive though, so wondered if anyone has seen a similar fault and how they fixed it?

I have attached a scan below, and will try and make a data log when it happens.
Date: 2018-10-06 13:20

VIN: WAUZZZ8E55A506018
Car: Audi A4
Year: 2005
Body type: Avant
Engine: BKN 150 kW (204 HP) 3.0 l
Mileage: 269190 KM

01 Engine

System description: 3.0L V6TDI G000AG
Software number: 8E0910401F
Software version: 0060
Hardware number: 8E0907401AJ
Coding: 0011171

Trouble codes:
P1020 - Fuel Pressure Regulation Control limit exceeded Upper limit exceeded