P1020 High Pressure Fuel Fault Help

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

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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
static


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Did the flow metering valve fix it ?

Not got a new one yet, I have been away. I managed to pull the HPFP out on Monday as you have to remove it to get to the valve (much to my dismay as I had just put all the bumper back on, and to get the HPFP out it all has to come off to the service position)

I’m going to give it a good clean out and test tomorrow. If not it appears to be about £100 for a replacement.

I assume you have similar symptoms then, not a solution?

No, never had to go further then rail pressure regulator valve, so interesting to see.
Good luck !

Quote:

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Originally Posted by Renars

No, never had to go further then rail pressure regulator valve, so interesting to see.
Good luck !

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Did you have to do adaptions after replacing it or was it just plug and play?

I think it was plug and play !

So I have sent this to a diesel injection specialist, their diagnosis, after also speaking to Bosch technical I s either the HPFP Fuel Intake Metering valve, which can be bought for about £100 or a software problem.

I will update once I have replaced the valve, it has just come in today!

For anyone with this fault, replacing the metering valve on the back of the HPFP fixed it for me, now works flawlessly!

They aren’t available for the A4 from Audi, however a VW crafter uses the same valve and they will sell it to you for ~£100.

Audi/VW part #: 059 906 457
Bosch part #: 0928400676

Very useful information, did you use the part numbers off of the old one to do this? 059 906 457 is £204.73 genuine so did you use one from Bosch?

Internet research gave me this information, as Audi’s only advice was a whole HPFP! I just started searching for the part number that was printed on the valve.

I ordered one through a company called Thames Valley Electro Diesels. eBay has many new ones listed though. Genuine Bosch units.