Fuel Pressue Issues

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NyB8

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I've been having trouble with the Avant (TDI 143HP) recently. Started off with a lumpy idle did a scan and got the following code

1 Fault Found:
5175 - Fuel Pressure Regulation
P1065 00 [109] - Regulation Discrepancy
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 2
Mileage: 170100 km
Date: 2019.02.13
Time: 19:17:30

I change a fuel pressure regulation sensor (part number 057130764H) and now the car has gone in to limp mode. I did a scan and now have the following codes.

2 Faults Found:
5211 - Fuel Rail/System Pressure
P0087 00 [101] - Too Low
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 171494 km
Date: 2019.03.11
Time: 21:07:57

5212 - Fuel Rail/System Pressure
P0087 00 [101] - Too Low
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 171494 km
Date: 2019.03.11
Time: 21:08:03
Readiness: 0 0 0 0 0

So now I'm starting to wonder if it is an issue with the control valve or even worse the HP fuel pump.

I would appreciate some advice as i'm pulling my hair our and I don't have much of it!
 
I presume you have changed the fuel filter?. The fuel pump that feeds the main high pressure pump on the engine is by the fuel filter. You need to make s sure this pump is working correctly.
After that you have a Bosch CP4 high pressure pump which are not the best. There are class action suits in America against Bosch for the poor design of these pumps.
If somebody has put contaminated diesel in or petrol in the car at some point this can cause failure of the pump quite quickly.
http://forums.tdiclub.com/showthread.php?t=387252
 
Yep changed the fuel filter the other week, will check that thread later
 
So after changing my rear discs and pads (quite an easy job, apart from the pad warning not disappearing in the DIS!). I had another look at the rough idle issue. I pulled of the plug that connects the sensor on the other side of the fuel rail and hey presto, idles perfectly, plugged it back in and it went back to rough idle. I also checked for any deposits in the hp fuel pump, thankfully it's clean. So no I need to try and identify the part number for sensor, i'm aware there are quite a few variants, so if anyone knows the correct part number, it would be greatly appreciated.
 

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If that is your sensor then the part number is on it 03L906054 There are other sensors such as 03L906054A which looks to be the same .
https://www.autodoc.co.uk/meat-doria/7908840
When you disconnect the fuel pressure sensor the ECU cannot see the fuel pressure so goes into limp mode to get you home, and will command the pump pressure regulator to a position where the pressure is high enough to get you mome.
It's possible the sensor is faulty but also possible that the by disconnecting it you are masking the real issue.
 
desertstorm said:
If that is your sensor then the part number is on it 03L906054 There are other sensors such as 03L906054A which looks to be the same .
https://www.autodoc.co.uk/meat-doria/7908840
When you disconnect the fuel pressure sensor the ECU cannot see the fuel pressure so goes into limp mode to get you home, and will command the pump pressure regulator to a position where the pressure is high enough to get you mome.
It's possible the sensor is faulty but also possible that the by disconnecting it you are masking the real issue.
Click to expand...

I noticed that the original p/n for my car is 03L906051, but this number seems to be obsolete (cancelled since 01.07.2012). How can I find out what the current p/n is?
 

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audi upgrades
That link I posted has a list of compatible part numbers. 03L906051 is the same as 03L906054 .
Upload 2019 3 16 23 3 58
 
Any 2000bar sensor will do (just needs to be M18 thread).
But you should try resetting the adaption for the rail pressure sensor first
 
Latest:

So I rest learned values, and things calmed down for a few minutes and then the rough idle came back. So changed the sensor and once again, there was no change. I think it is a case of digging deeper. I think its either now looking like injectors, hp fuel pump or the in tank pump. I have video showing my injector values which I will try to upload. I appreciate any input a this is starting to get frustrating
 
Latest:

So I decided to put the old PRV back on and the rough idle was the same if not worse, but when I did a scan. I only got one fault code which is the original one that I posted at the start of the thread:

5175 - Fuel Pressure Regulation
P1065 00 [101] - Regulation Discrepancy
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 172124 km
Date: 2019.03.26
Time: 07:47:47

Weirdly enough the low pressure fault didn't re appear. So now I'm also questioning the validity of the part I purchased??
 
Do you mean you put the Pressure Control Valve on the rail?
Whereabouts in the UK are you - if you want me to take a look I can (I'm 10mins from Heathrow)

I would attempt to do an adaption on the PCV and metering unit.

Do you get low rail pressure during wide open throttle? (peak torque)
 
bobby singh said:
Do you mean you put the Pressure Control Valve on the rail?
Whereabouts in the UK are you - if you want me to take a look I can (I'm 10mins from Heathrow)

I would attempt to do an adaption on the PCV and metering unit.

Do you get low rail pressure during wide open throttle? (peak torque)
Click to expand...


Yes thats correct the PCV, I put the old one back on as I was getting low pressure errors with new one I had purchased (convinced its not a genuine and new part it had a 2011 production date!!!).

Not able to achieve peak torque as i'm stuck in limp mode. These issues are more noticeable at first startup, it settles a little down as the engine warms up. I did do a reset of the PCV in VCDS.

I'm based in Nottingham, I'm planning on seeing an Audi specialist near me week to give me some guidance.
 
FINALLY SORTED :rockwoot:

So after doing a few further checks, I purchased another PCV from an official VW/Audi vendor. Installed it and the rough idle disappeared, however the car was still felt like it was in limp mode (flashing glowplug light) due to particle filter warning (measured value 42g), which was a knock on effect from the first issue (PCV) After some hard driving I thankfully managed to clear it (in a puff of smoke!), the measured value is now down to 9.33g. Car feels like new again!

The moral of the story, when it comes to parts particularly sensors, buy from official vendors and not ebay!

Thanks guys and to Matt at Hirsch-Tech for all the advice and help. :thumbs up:
 
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Hello and sorry for resurrecting an old thread but I think I'm having the same issue. Currently my car has no errors when scanned via VCDS.
The injectors are in good shape judging by the values, but car idles rough at times, engine shaking. Could you please reconfirm the fuel pressure sensor was the problem 03L 906 051?
 
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Ivan Angelov said:
Hello and sorry for resurrecting an old thread but I think I'm having the same issue. Currently my car has no errors when scanned via VCDS.
The injectors are in good shape judging by the values, but car idles rough at times, engine shaking. Could you please reconfirm the fuel pressure sensor was the problem 03L 906 051?
Click to expand...

For me it was the problem, I ended up purchasing a genuine part from TPS the part number was 057 130 764H. How do you find it on first start ie in the mornings?
 

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NyB8 said:
For me it was the problem, I ended up purchasing a genuine part from TPS the part number was 057 130 764H. How do you find it on first start ie in the mornings?
Click to expand...
It starts without problems, but some times the idle is rough and sometimes is fine. Found out that if i press accelerator pedal ever so slightly and release, I can force that rough idle.
 
NyB8 said:
FINALLY SORTED :rockwoot:

So after doing a few further checks, I purchased another PCV from an official VW/Audi vendor. Installed it and the rough idle disappeared, however the car was still felt like it was in limp mode (flashing glowplug light) due to particle filter warning (measured value 42g), which was a knock on effect from the first issue (PCV) After some hard driving I thankfully managed to clear it (in a puff of smoke!), the measured value is now down to 9.33g. Car feels like new again!

The moral of the story, when it comes to parts particularly sensors, buy from official vendors and not ebay!

Thanks guys and to Matt at Hirsch-Tech for all the advice and help. :thumbs up:
Click to expand...


interesting thread. Glad to see other people are having similar damn irritating issues to me.and have solved the issue! ;)

my 2010 a4 b8 2.0 tdi CAGA avant recently developed the rough idle issue two weeks ago. It starts without issue, but sounds like a tractor when idling at 900 revs and coughs. Rev it a little to 1100 - 1300 and the idling normalises.
Driving it, absolutely no issues until you come to a set of lights and pull up, it idles and starts coughing again.
Motorway as well as normal driving is fine. No warning light on dash.

However, this error exists, like yours:

1 Fault Found:
5175 - Fuel Pressure Regulation
P1065 00 [039] - Regulation Discrepancy
Confirmed - Tested Since Memory Clear


I've had the car in to a local indy VAG specialist this week, who did some tests on it -

1. Investigate hunting at idle
2. Carry on diag check - fault code stored for fuel pressure
3. Carry out test on in tank fuel pump - all ok.
4. Carry out test on inline fuel pump - all ok.
5. Carr out leak back test on injectors - all ok.
6. Carry out de-cay test. All ok.
7. Carry out testing on injectors using scope. ok.

They handed the car back to me with the same rough idle issue. I don't have much money burning a hole in my pocket currently ;),
but they've tested the fuel system for me.

I've only had this car for 3 months, the previous owner had the following work done in Feb 20 at a Bosch Service specialist up in Bucks, less than a year ago due to a non-start at the time:
Crank Sensor replaced
Fuel Control Valve replaced
High Pressure Pump replaced
Timing Belt Kit
Water Pump

The indy says the next port of call would be to contact the previous garage. However and apparently the pump fitted (according to bill which I have) is a 'cheaper' version at a whopping 590.00£.... pretty expensive pump even if it is the cheaper version and I really don't think it has failed already?!!?
After that look at the injectors, they say...

But the car runs all too good, until you get to some lights, so my gut tells me to look at sensors before pump or the injectors, in which case I may just
throw the car away ;)

I'm going to swap the under body fuel filter tomorrow, and look at getting the sensor seeing it has sorted the problem for you.
Like you, I need the same discontinued part number but will be getting that to kick off.
If you have any other ideas, considering the above... I'd love to hear them.

thanks
 
With any CP4 pump equiped car always check for metal flooting in the pump - easy enough to remove the metering unit and check.
If you find metal it means the pump has eaten itself and metal has made its way to the Rail, sensors and injectors.
 
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bobby singh said:
With any CP4 pump equiped car always check for metal flooting in the pump - easy enough to remove the metering unit and check.
If you find metal it means the pump has eaten itself and metal has made its way to the Rail, sensors and injectors.
Click to expand...

Hi, what do you mean by CP4 pump? The Pump on the front of the motor block? Sorry for being an idiot. Where do I find this pump to look? ;)
EDIT: Sorry just found what you meant by the CP4 pump, it's the High Pressure Pump by Bosch.

Surely a failed pump would cause issues across the rev range and not just at idle?

Also, what do you think about the HVPump price of 584£ The VAG specialist the car was at this week seemed to think the original VAG part is closer to 1000£ and seemed to diss the fact that a 'cheap' part was put in the car back in Feb?
Having just checked autodoc... the (quality german) HP pumps are all in the 400-600£ region. Slightly confused now as to what that VAG specialist was getting at now, since it seems to be the going rate for the pump part. What pump could he have been thinking about?
 
Last edited:
Looking at all the work you have had done, I would check for any shards in the feul punp which is a quick job. But from what I have seen above I would strongly suggest changing your fuel pressure regulator. I have just has a look on youtube for the orignal video that I found helpful, but I have found this one that basically explains the same issue, it's in Italian (I think), but it should make sense.

 
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DarthVAG said:
Hi, what do you mean by CP4 pump? The Pump on the front of the motor block? Sorry for being an idiot. Where do I find this pump to look? ;)
EDIT: Sorry just found what you meant by the CP4 pump, it's the High Pressure Pump by Bosch.

Surely a failed pump would cause issues across the rev range and not just at idle?

Also, what do you think about the HVPump price of 584£ The VAG specialist the car was at this week seemed to think the original VAG part is closer to 1000£ and seemed to diss the fact that a 'cheap' part was put in the car back in Feb?
Having just checked autodoc... the (quality german) HP pumps are all in the 400-600£ region. Slightly confused now as to what that VAG specialist was getting at now, since it seems to be the going rate for the pump part. What pump could he have been thinking about?
Click to expand...
I would put the money towards a CP3 fuel pump rather than re investing in a CP4 again.
I keep CP3 fuel pump kits for the 2.0 common rail engine which is a far better pump for these engine - I calibrated one to run correctly around 2016 and the car drove well with no more worries about pump failure.
The CP3 is a far better design that the cursed cp4 item.

Cheers
 
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bobby singh said:
I would put the money towards a CP3 fuel pump rather than re investing in a CP4 again.
I keep CP3 fuel pump kits for the 2.0 common rail engine which is a far better pump for these engine - I calibrated one to run correctly around 2016 and the car drove well with no more worries about pump failure.
The CP3 is a far better design that the cursed cp4 item.

Cheers
Click to expand...
Thanks for your input. I'm checking on Autodoc for these HP pumps, and admittedly seem to be getting different information every time I look.
Yesterday there were several 'remanufactured' pumps... Bosch CP4 being one or two of them, in the price bracket of 400-600£.
Today, having checked, there are Febi and Swag pumps for £1100 on there, which weren't there yesterday. Confusing.

Can you provide a part number for the CP3 you mention? How much are they?

thanking you.
 
NyB8 said:
Looking at all the work you have had done, I would check for any shards in the feul punp which is a quick job. But from what I have seen above I would strongly suggest changing your fuel pressure regulator. I have just has a look on youtube for the orignal video that I found helpful, but I have found this one that basically explains the same issue, it's in Italian (I think), but it should make sense.

Click to expand...

thank you for this. I have ordered the regulator and this is where I will start. Will also check the pump for shards as you and Bobby Singh suggest. Would have thought though the indy shop would have done this during their investigations? But I will make sure....
 
DarthVAG said:
Thanks for your input. I'm checking on Autodoc for these HP pumps, and admittedly seem to be getting different information every time I look.
Yesterday there were several 'remanufactured' pumps... Bosch CP4 being one or two of them, in the price bracket of 400-600£.
Today, having checked, there are Febi and Swag pumps for £1100 on there, which weren't there yesterday. Confusing.

Can you provide a part number for the CP3 you mention? How much are they?

thanking you.
Click to expand...
Pump (tested used item, bracket, pulley, pipe work and fixings are £550 supplied. You need to handy with a spanner to install this kit and it will need tuning after for which I'll need the car for around two days.
Best to email if you want to go this route as pricing can vary depending on if you the timing belt changed at the sametime, spec of the car etc

Cheers
 
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NyB8 said:
Looking at all the work you have had done, I would check for any shards in the feul punp which is a quick job. But from what I have seen above I would strongly suggest changing your fuel pressure regulator. I have just has a look on youtube for the orignal video that I found helpful, but I have found this one that basically explains the same issue, it's in Italian (I think), but it should make sense.

Click to expand...

thanks for input. Im going to change out the PRV and sensor on the other end tomorrow. fingers crossed.
 
So I managed to get the following items on ebay at very reasonable cost. They were both brand new.

- Delphi Fuel Rail High Pressure Sensor (03L906054A)
- Bosch Pressure Relief Valve (057130764H)

The swap out was pretty easy and completed within half hour.

After swapping the parts I ran the VCDS to prime the fuel delivery pumps.
I started the car, and my rough idle was gone and my car is running normally again now. No Fault codes reappeared. I have done about 100 miles in the car since so far so good.

The old PRV that came out, I did notice that on the nib which sits inside the rail seemed to have some contamination. I am not quite sure what the contaminants are, they are very small... and cannot be sure where they have come from. They may be metal, the previous owner of the car had a CP4 HP pump fitted around 8000 miles ago together with crank sensor according to the paperwork (due to non starting)... so perhaps these are left-overs from then? Not sure.

IMG 4306





Precautionary, I may check the new installed PRV in the next week or two to see if any debris have accumulated again. I am also going to email the shop that performed the HP pump install for the previous owner who are a Bosch Service Specialist to find out what they say to this, since the HP pump is still under warranty.
But for now, it is all working without any issues. I hope it stays this way.
 
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Ivan Angelov said:
It starts without problems, but some times the idle is rough and sometimes is fine. Found out that if i press accelerator pedal ever so slightly and release, I can force that rough idle.
Click to expand...
Hello Ivan, I want ask you if you have solved your problem? Because I have same problem as you and do not know what to do.
 
Edvinas5551 said:
Hello Ivan, I want ask you if you have solved your problem? Because I have same problem as you and do not know what to do.
Click to expand...
Hello. I haven't solved it yet, but I'm almost sure it's the pressure control valve on the fuel rail, because a friend of mine had the same issue and changing it solved the problem for him. Mine is better, tho I still feel it a little, maybe because I use premium fuel and some cleaning additives.
 
hi Boby Sing - you were mentioning that CP3 pump and do you have the part number for the same? i have 2.0 TDI CR 101/83 engine. i also have the same issue and please help
 
CP3 pump is not a pnp solution it requires tuning in - if you are far from me and want to go down this route ensure your tuner can do the work.
I have the CP3 kits in stock - I use them on high power 2.0CR projects but they are also a great way to get rid of the CP4 fuel pump

Cheers
 
bobby singh said:
CP3 pump is not a pnp solution it requires tuning in - if you are far from me and want to go down this route ensure your tuner can do the work.
I have the CP3 kits in stock - I use them on high power 2.0CR projects but they are also a great way to get rid of the CP4 fuel pump

Cheers
Click to expand...
hi Boby - thank you so much for your response. I am too far away from your country. i have the same issue as shared by NyB8 in the beginning of this thread. I removed the valve in the HPP and noticed no metal warps. its clean I also removed the return fuel from the distributor after removing the return line to check whether we ge 90 to 110 ml for 30 seconds. it passed that means the pressure regular is seems to be working and removed the pressure sender and looks like it has some interment issue. looks like the pressure in the low side and high side to be tested. is there any other check that i need to check. please help. i have the vcds.
 
bobby singh said:
Try to reset the adaption for the metering unit and the pressure control valve with VCDS
Click to expand...
thanks Boby. appreciate your help. how do i do this? my ECM is UDS, so advance measuring block and then? can you driect it to me please
 
Look under basic settings or adaption you will find a label called reset learned values for metering unit and pressure control value
 
bobby singh said:
Look under basic settings or adaption you will find a label called reset learned values for metering unit and pressure control value
bobby singh said:
Look under basic settings or adaption you will find a label called reset learned values for metering unit and pressure control value
Click to expand...
thanks Bobby. Good morning. i will check and confirm. I hope i need to reset the values to zero. once again thangs a ton for your advise. also please let me know the tuning that i need to do to replace the CP4 with CP3 HPP. let me see if i can do that my self. i have all the tools. do you have any procedure then i can buy the kits from you.
Click to expand...
 
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