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  1. #1
    Senior Member Three Rings challenger's Avatar
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    Cant get rid of this code! 8851-Fuel Pressure Regulator Valve

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    I have been having boost issues for awhile now. What will happen is at WOT in 3rd, 4th, 5th or 6th gear my boost will spike at around 21psi hold for a little drop to about 7-10psi fluctuate from 7-13 or so a few times and I can feel the power being lost and gained as it fluctuated and then it would shoot into limp mode. The higher the gear the faster it would go into limp mode. Then after about a minute I would have full boost again. My CEL light has not been on for months during this issue. Yesterday, I got on it a little and it happened again in 3rd gear but my CEL light popped on this time of course. I scanned it and this code came on, 8851-Fuel Pressure Regulator Valve (n276) - Lower Limit Exceeded. Iv changed my HPFP, N80, LPFP, and Fuel filter a little under a year ago. Today I changed my N75 sensor and cleaned my DV, still having the issue. I have been away at college so I haven't been able to address the issue till now. Could it be possible that the Fuel Pressure Regulator valve is restricting it? I don't even know where to go from here.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  2. #2
    Veteran Member Four Rings Okedokey's Avatar
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    The PRV will vent over I think 110psi(?). The RS4 is higher, easy to replace although not cheap. Worth logging your fuel rail pressures with VCDS while WOT. See if it sharply flat-lines, if so, you can replace that.
    A4 B7 2.0T | HPFP upgrade + FMIC | BSR Stage II + exhaust + HFC | 3.0TFSI Throt. Body | RS4 fuel contr., PRV + S3 inj., G247 + DW300c | GFB DV+| 034 RSB + all arms and mounts | S4 brakes | B12 Bilstein suspension + H&R springs | RNS-E + Polk Audio PA D5000.5 - 4 x DB6502 + DB840DVC sub + Pioneer 10" sub | LEDs throughout | 19" Audi 2015 RS4 rims

    My respray thread

  3. #3
    Veteran Member Four Rings Charles.waite's Avatar
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    http://wiki.ross-tech.com/wiki/index...5/P2293/008851

    My guess is a bad/incorrect pressure sender on the rail. It could also be a bad pressure release valve as you said.

    Quote Originally Posted by Okedokey View Post
    The PRV will vent over I think 110psi(?). The RS4 is higher, easy to replace although not cheap. Worth logging your fuel rail pressures with VCDS while WOT. See if it sharply flat-lines, if so, you can replace that.
    Logging would easily rule out the relief valve. OP if you have access to VCDS do that and see what kind of rail pressure you're seeing when the engine falters.
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  4. #4
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by Okedokey View Post
    The PRV will vent over I think 110psi(?). The RS4 is higher, easy to replace although not cheap. Worth logging your fuel rail pressures with VCDS while WOT. See if it sharply flat-lines, if so, you can replace that.

    Quote Originally Posted by Charles.waite View Post
    http://wiki.ross-tech.com/wiki/index...5/P2293/008851

    My guess is a bad/incorrect pressure sender on the rail. It could also be a bad pressure release valve as you said.



    Logging would easily rule out the relief valve. OP if you have access to VCDS do that and see what kind of rail pressure you're seeing when the engine falters.

    I don't have a VCDS is it easy to log? I'm not really familiar with it. Does a freeze frame of when the CEL light came on from the scanner help?
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  5. #5
    Veteran Member Four Rings Charles.waite's Avatar
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    Cant get rid of this code! 8851-Fuel Pressure Regulator Valve

    Freeze frame might help. You can't really log most of that stuff without vcds. You might be able to see live rail pressure data from a Bluetooth OBD2 reader and an app with the proper PID values, but I've got zero clue if that possible or what app to use if it is.
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  6. #6
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by Charles.waite View Post
    Freeze frame might help. You can't really log most of that stuff without vcds. You might be able to see live rail pressure data from a Bluetooth OBD2 reader and an app with the proper PID values, but I've got zero clue if that possible or what app to use if it is.
    Here is what I pulled from the freeze fame log on my scanner. I believe there is a way to log data on it but honestly cant figure out how to save it.

    8851

    Fault status: 00100010
    Fault Priority: 0
    Fault Frequency: 4
    Mileage: 179769 km
    Time indication: 0
    RPM: 5045 / min
    Load: 9.4 % (89% last time)
    Speed: 145 km/h
    Temp: 91 C
    Temp: 31 C
    Absolute pressure: 970.00 mbar
    Voltage: 13.462 V
    Timing Angle: 6.8 degrees ATDC

    Not sure if this helps at all but throwing it up there.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  7. #7
    Veteran Member Four Rings Okedokey's Avatar
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    That timing angle seems out to me?
    A4 B7 2.0T | HPFP upgrade + FMIC | BSR Stage II + exhaust + HFC | 3.0TFSI Throt. Body | RS4 fuel contr., PRV + S3 inj., G247 + DW300c | GFB DV+| 034 RSB + all arms and mounts | S4 brakes | B12 Bilstein suspension + H&R springs | RNS-E + Polk Audio PA D5000.5 - 4 x DB6502 + DB840DVC sub + Pioneer 10" sub | LEDs throughout | 19" Audi 2015 RS4 rims

    My respray thread

  8. #8
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by Okedokey View Post
    That timing angle seems out to me?
    Whats normal?
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  9. #9
    Veteran Member Four Rings Charles.waite's Avatar
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    Cant get rid of this code! 8851-Fuel Pressure Regulator Valve

    Can't really asses the timing angle from that freeze frame though. Load is only 9.4% so he's basically off the throttle at that freeze frame moment. And boost is zero (970mbar is more or less atmospheric pressure) so there's no load and no boost.

    Other than that there's not really much info you can glean from the freeze frame regarding this code...
    -CP
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    Former USP CLUB MEMBER #136
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  10. #10
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by Charles.waite View Post
    Can't really asses the timing angle from that freeze frame though. Load is only 9.4% so he's basically off the throttle at that freeze frame moment. And boost is zero (970mbar is more or less atmospheric pressure) so there's no load and no boost.

    Other than that there's not really much info you can glean from the freeze frame regarding this code...
    That's what I figured. I was hoping i didnt have to spend a few hundred on a vcds. Anyone have any recommendations on which one to buy? I heard people being successful with the cheap ebay ones but not sure which one is a solid choice.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  11. #11
    Veteran Member Four Rings Charles.waite's Avatar
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    Quote Originally Posted by challenger View Post
    That's what I figured. I was hoping i didnt have to spend a few hundred on a vcds. Anyone have any recommendations on which one to buy? I heard people being successful with the cheap ebay ones but not sure which one is a solid choice.
    The eBay ones are hit or miss.

    If you can swing it buy a legitimate one from Ross-Tech. Especially with engine stuff, lots of the eBay ones don't work with CAN-BUS which is required for engine communication.

    Aside from the fact that I don't really support buying a knockoff product...
    -CP
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  12. #12
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by Charles.waite View Post
    The eBay ones are hit or miss.

    If you can swing it buy a legitimate one from Ross-Tech. Especially with engine stuff, lots of the eBay ones don't work with CAN-BUS which is required for engine communication.

    Aside from the fact that I don't really support buying a knockoff product...
    If I cant figure out how to log from this scanner then Ross-Tech it is! Thanks for the help. Will keep you posted in the next few days or so.

    Also, If i were to upgrade my PRV yo say 135 or 145 bar will thet mess with my tune in any way? I was looking through forms and saw that someone had problems with it on a JHM tune.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  13. #13
    Senior Member Three Rings challenger's Avatar
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    Hopefully this helps at all... Best I could do with this thing. If there is any other info needed let me know.

    6th gear pull at WOT till limp mode:










    1-4th Gear WOT:








    Last edited by challenger; 07-06-2016 at 01:20 PM.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  14. #14
    Senior Member Three Rings challenger's Avatar
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    BUMP!
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  15. #15
    Veteran Member Four Rings Charles.waite's Avatar
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    Not sure if it's just me but none of those pictures show up on tapatalk.
    -CP
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    2017 Q7 3.0t
    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
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  16. #16
    Veteran Member Four Rings Okedokey's Avatar
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    Pics don't show.
    A4 B7 2.0T | HPFP upgrade + FMIC | BSR Stage II + exhaust + HFC | 3.0TFSI Throt. Body | RS4 fuel contr., PRV + S3 inj., G247 + DW300c | GFB DV+| 034 RSB + all arms and mounts | S4 brakes | B12 Bilstein suspension + H&R springs | RNS-E + Polk Audio PA D5000.5 - 4 x DB6502 + DB840DVC sub + Pioneer 10" sub | LEDs throughout | 19" Audi 2015 RS4 rims

    My respray thread

  17. #17
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by Charles.waite View Post
    Not sure if it's just me but none of those pictures show up on tapatalk.
    Quote Originally Posted by Okedokey View Post
    Pics don't show.
    Fixed it sorry about that it must have been the way I uploaded them.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  18. #18
    Veteran Member Four Rings canadianA4B7's Avatar
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    Just removed my stock prv few days ago. It worked fine for me even on my stage 3 tune. If interested shoot me an offer on it. Include shipping and I'll package the little pressure releasing monster to you ASAP.

  19. #19
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by canadianA4B7 View Post
    Just removed my stock prv few days ago. It worked fine for me even on my stage 3 tune. If interested shoot me an offer on it. Include shipping and I'll package the little pressure releasing monster to you ASAP.
    You are selling your stock prv? I just bought a new HPFP under a year ago which came with a new prv. I cant imagine it being that but thank you!. If anything I would try to go with a 135 or 145 bar to see if that helps.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  20. #20
    Veteran Member Four Rings canadianA4B7's Avatar
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    Just throwing out an option. Not saying it's that or it isn't. But figured a stock unit might just scratch it off the list of it being a problem. If it comes down to it let me know ill send her to you to test it out to scratch off the list of possible issues. In the world of modding it cud be anything. This is a joke but try switching to decaf coffee. I dunno if it will help but at this point any things worth a try.

  21. #21
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by canadianA4B7 View Post
    Just throwing out an option. Not saying it's that or it isn't. But figured a stock unit might just scratch it off the list of it being a problem. If it comes down to it let me know ill send her to you to test it out to scratch off the list of possible issues. In the world of modding it cud be anything. This is a joke but try switching to decaf coffee. I dunno if it will help but at this point any things worth a try.
    I couldn't agree more. I'm going to try my old one and see if that makes a difference. I will let you know thanks again!
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  22. #22
    Senior Member Three Rings challenger's Avatar
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    Replaced my prv yesterday with a stock one and still the same problem
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  23. #23
    Veteran Member Four Rings canadianA4B7's Avatar
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    Quote Originally Posted by challenger View Post
    Replaced my prv yesterday with a stock one and still the same problem
    Ok so now you've scratched that off (glad u did) it's time to investigate further.

    Does your car have the metal fuel line connecting fuel from tank, hpfp and prv?

    My car at one point in a custom tune was cutting out. In higher rpm only went limp mode 1x. Now I was getting close to reaching injector max pressure and also realized the oem metal lines could have been starving the fuel rail from getting optimal fuel. I don't know if this will help at all it's just a thought. But I've changed out the lines for 3/8" rubber and my prv piece is now stainless hard line only enlarged from 6mm to 1/4". I hope someone else can chime in on weather this will have any effect just trying to think outside the box.

  24. #24
    Veteran Member Four Rings Okedokey's Avatar
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    Those charts are pretty meaningless over 6 seconds or so. You need to log it for a longer time.
    A4 B7 2.0T | HPFP upgrade + FMIC | BSR Stage II + exhaust + HFC | 3.0TFSI Throt. Body | RS4 fuel contr., PRV + S3 inj., G247 + DW300c | GFB DV+| 034 RSB + all arms and mounts | S4 brakes | B12 Bilstein suspension + H&R springs | RNS-E + Polk Audio PA D5000.5 - 4 x DB6502 + DB840DVC sub + Pioneer 10" sub | LEDs throughout | 19" Audi 2015 RS4 rims

    My respray thread

  25. #25
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by canadianA4B7 View Post
    Ok so now you've scratched that off (glad u did) it's time to investigate further.

    Does your car have the metal fuel line connecting fuel from tank, hpfp and prv?

    My car at one point in a custom tune was cutting out. In higher rpm only went limp mode 1x. Now I was getting close to reaching injector max pressure and also realized the oem metal lines could have been starving the fuel rail from getting optimal fuel. I don't know if this will help at all it's just a thought. But I've changed out the lines for 3/8" rubber and my prv piece is now stainless hard line only enlarged from 6mm to 1/4". I hope someone else can chime in on weather this will have any effect just trying to think outside the box.
    I think from the tank its rubber/plastic but at the fuel pump to the prv is metal.

    Quote Originally Posted by Okedokey View Post
    Those charts are pretty meaningless over 6 seconds or so. You need to log it for a longer time.
    That was the best I could do with that scanner so I figured id throw it up here and see if anyone could make something of it.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  26. #26
    Veteran Member Four Rings Charles.waite's Avatar
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    Stock fuel lines aren't a limit until like 500hp. I wouldn't even worry about those.
    -CP
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    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
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  27. #27
    Senior Member Three Rings challenger's Avatar
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    Maybe its just my tune... I was thinking I would just swap out my HPFP internals for the JHM upgraded ones and then get it tuned by JHM. Maybe that will make up for my low side?
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  28. #28
    Veteran Member Four Rings Charles.waite's Avatar
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    Could be. Unitronic has some dodgy tunes sometimes.
    -CP
    2008 2.0t S-Line Ti 6MT Avant
    2017 Q7 3.0t
    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  29. #29
    Veteran Member Four Rings Okedokey's Avatar
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    I know you said you changed your HPFP, but when is the last time you checked your cam follower? Also have a read here if you haven't already http://wiki.ross-tech.com/wiki/index...5/P2293/008851

    edit: sorry saw that Charles has already posted this link. Just go through it again and make sure everything is good.
    A4 B7 2.0T | HPFP upgrade + FMIC | BSR Stage II + exhaust + HFC | 3.0TFSI Throt. Body | RS4 fuel contr., PRV + S3 inj., G247 + DW300c | GFB DV+| 034 RSB + all arms and mounts | S4 brakes | B12 Bilstein suspension + H&R springs | RNS-E + Polk Audio PA D5000.5 - 4 x DB6502 + DB840DVC sub + Pioneer 10" sub | LEDs throughout | 19" Audi 2015 RS4 rims

    My respray thread

  30. #30
    Veteran Member Three Rings allstock's Avatar
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    Quote Originally Posted by challenger View Post
    Maybe its just my tune... I was thinking I would just swap out my HPFP internals for the JHM upgraded ones and then get it tuned by JHM. Maybe that will make up for my low side?
    If you're going to spend more money on another tune and more bolt-ons in attempt to solve these issues, wouldn't it be the wiser to just get vcds. Try locally to see if you can get access to a full scan and logging in real-time.

  31. #31
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by Okedokey View Post
    I know you said you changed your HPFP, but when is the last time you checked your cam follower? Also have a read here if you haven't already http://wiki.ross-tech.com/wiki/index...5/P2293/008851

    edit: sorry saw that Charles has already posted this link. Just go through it again and make sure everything is good.
    Its probably been a little under a year since I checked it. I guess its time to do that, but thanks ill run through that check list again.

    Quote Originally Posted by allstock View Post
    If you're going to spend more money on another tune and more bolt-ons in attempt to solve these issues, wouldn't it be the wiser to just get vcds. Try locally to see if you can get access to a full scan and logging in real-time.
    I wanted to go this rout regardless of the problem after hearing all the talk about JHM, but held off so far since this problem started and well college funds weren't the greatest. Ill have to get back to this when I return from my vacation this week.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

  32. #32
    Veteran Member Four Rings Okedokey's Avatar
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    Yeah check the cam follower for sure. Possible someone here has a VCDS you can borrow ?
    A4 B7 2.0T | HPFP upgrade + FMIC | BSR Stage II + exhaust + HFC | 3.0TFSI Throt. Body | RS4 fuel contr., PRV + S3 inj., G247 + DW300c | GFB DV+| 034 RSB + all arms and mounts | S4 brakes | B12 Bilstein suspension + H&R springs | RNS-E + Polk Audio PA D5000.5 - 4 x DB6502 + DB840DVC sub + Pioneer 10" sub | LEDs throughout | 19" Audi 2015 RS4 rims

    My respray thread

  33. #33
    Senior Member Three Rings challenger's Avatar
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    Quote Originally Posted by Okedokey View Post
    Yeah check the cam follower for sure. Possible someone here has a VCDS you can borrow ?
    That is definitely the first thing I will do when I'm back. If anyone is in the New York Westchester area that would be great! I will be back in a week and have an update on that cam follower thanks again so far.
    2013 Blue Raspberry S4 B8.5 - IE Stage 2 Dual Pulley E40

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