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    Thread: P0171 back again!@#!@#

    1. Member Vinnyty's Avatar
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      01-23-2011 03:37 PM #1
      So i brought the car to the dealership and so far they have blamed the p0171 on the pcv valve then my forge air intake and then another dealership fixed the purge valve but now its back.

    2. Member Vinnyty's Avatar
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      01-23-2011 05:03 PM #2
      Help meeeeeeeeeeee! This is the list im going to have the dealer check.

      02 sensors,
      diverter valve,
      intake flapper
      mass air sensor
      cam follower.

      Maybe its one of those.

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      01-23-2011 06:42 PM #3
      P0171 - System Fuel Lean

      Typically that can be related back to a vacuum leak somewhere. Thats a good starting point.

    4. Member Vinnyty's Avatar
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      01-23-2011 06:58 PM #4
      it has been in 3 or 4 times and they thought they fixed it. Blamed it on the turbo inlet hose on my forge kit which is really tight so that cant be it.

    5. 01-23-2011 07:10 PM #5
      why not reinstall oem intake and then let them deal with it. once it is fixed go back to your forge intake.
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    6. Member Jettn1's Avatar
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      01-24-2011 10:39 AM #6
      Quote Originally Posted by Vinnyty View Post
      Help meeeeeeeeeeee! This is the list im going to have the dealer check.

      02 sensors,
      diverter valve,
      intake flapper
      mass air sensor
      cam follower.

      Maybe its one of those.
      When my cam follower was shot....mine threw the P0171, ad also the CEL would come and go and eventually it stayed on. Of course I had the typical issues that goes along with it....hence limp mode and some jerking when trying to pass people. Depending on if it is the cam follower and how bad of shape it is....you sometimes have to get a new HPFP and cam shaft also. GL to ya!!
      1999 Jetta GL - 1998 to 2003 my first VW
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    7. Member Jettn1's Avatar
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      01-24-2011 10:46 AM #7
      Quote Originally Posted by Vinnyty View Post
      Help meeeeeeeeeeee! This is the list im going to have the dealer check.

      02 sensors,
      diverter valve,
      intake flapper
      mass air sensor
      cam follower.

      Maybe its one of those.

      Sorry for earlier post that was when I was getting the P2293....When mine threw the P0171...it was the intake flapper. Had it replaced and never had a problem again. I didn't even have any issues other than the CEL coming and going. GL to ya!!
      1999 Jetta GL - 1998 to 2003 my first VW
      2002 Nissan Altima - 2003 to 2006 JUNK!! went back to VW
      2006 Jetta 2.5 - 2006 to 2010
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    8. Member Vinnyty's Avatar
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      01-24-2011 04:11 PM #8
      Im getting some misfire codes now.

      p0300
      p0302
      p0300 pending
      p0302 pending
      p0301 pending

      Freeze frame data pulled from loaner scan tool at advance auto :

      DTC Caused freeze frame p0171 > Throttle Position > 18.00%

      RPM > 1837
      Barometric pressure > 99 KPA

      Load value > 23.5%

      Air Flow rait > 11.91 gr/sec

      Ambient air temp > 26 deg F

      Coolant temp > 143 deg F

      Air intake temp > 26 deg F

      Ignition timing adv > 14.0 deg

      Short term fuel trim > 1.5%

      Long term secondary 02s fuel trim bank 1 > 0.8%

      Short term Fuel trim 3 > -100.6%

      Long term fuel trim 3 > -100.6%

      Long term secondary 02s trim bank 3 > 100.6%

      Vehicle speed > 26mph
      Absolute load > value 35.0%
      Fuel pressure > 7040kpa
      Fuel system 1 > clsd
      Relative throttle position > 7.4%
      Command throttle actuator > 9.8%
      Absolute throttle position > 17.6
      Pedal position d > 32.1%
      Pedal Position e > 32.5%
      Evap purge > 0%

      Volts > 14.630
      Time since engine start > 3:58 m:s

    9. Member Vinnyty's Avatar
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      01-24-2011 07:28 PM #9
      all that info doesnt tell me much other than hints upon the flapper on the intake. any input?

    10. Member Vinnyty's Avatar
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      01-26-2011 11:06 PM #10
      So the car is back home after 2 days at the dealer. Laundry list of items fixed.

      Smoke tested and found small leak at oil breather fixed oring and replaced hose.
      Replaced valve cover gasket
      Fixed transmission valve body
      Pcv and purge valve replaced last week.
      smoke tested again no leaks.


      This was in the shop for the p0171 code

      Guess what IT Flying kite came back again!!! Was off for about 6-8 hours. They say they want the factory airbox on before further troubleshooting.

    11. Member passatfan2006's Avatar
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      01-27-2011 08:01 AM #11
      Quote Originally Posted by Vinnyty View Post
      Guess what IT Flying kite came back again!!! Was off for about 6-8 hours. They say they want the factory airbox on before further troubleshooting.
      Which makes sense. You are lucky that the dealer is not giving you grief with the non-oem intake. It is fairly easy for them to blame it on the current intake and wash their hands off.
      Your best bet is to restore the original intake and get it checked out before they change their mind

    12. Member Vinnyty's Avatar
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      01-27-2011 09:15 AM #12
      I dont understand why the forge intake is causing issues. Mike at forge said its not possible. I broke my factory airbox due to cold weather so im trying to track one down.

    13. Member Vinnyty's Avatar
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      01-27-2011 03:47 PM #13
      ITs really weird. the car runs great if im out for a long drive then it runs like crap. When its running good I can hear the turbo spool up then i can hear the blow off valve. When its running crappy I cant really hear the turbo suck in and i can barely hear the diverter valve.

    14. Member Vinnyty's Avatar
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      02-07-2011 07:25 PM #14
      so i have been working with rosstech on the vagcom tech forum here on the vortex. they had me read the idle and running trim levels. Looking like the running trim is out of whack. they also had me do a test on the maf running in 2nd gear at redline to see what the gallons per second were coming in the intake. Im only reading 60-80 g/s should be like 160-180 or 60% of horse power. going to dealership friday to have them replace Mass air flow.

    15. Member low_passat's Avatar
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      02-07-2011 09:47 PM #15
      Quote Originally Posted by Vinnyty View Post
      so i have been working with rosstech on the vagcom tech forum here on the vortex. they had me read the idle and running trim levels. Looking like the running trim is out of whack. they also had me do a test on the maf running in 2nd gear at redline to see what the gallons per second were coming in the intake. Im only reading 60-80 g/s should be like 160-180 or 60% of horse power. going to dealership friday to have them replace Mass air flow.
      Are you going to have the orginal air box/intake on? If not I suspect they will give you grief about your intake and say you screwed it up when you did the intake install.
      2007 Candy White/Black Passat 2.0T Wolfsburg Edition| APR Stage 2+ | APR HPFP | Forge WINtake | S3 Intercooler | B&B 3" Turbo-Back Exhaust | Dogbone Insert | FK Silverline+ Coilovers | Front Lip Spoiler/Hi-Def Sideskirts | Votex Trunk Lip Spoiler | R-Line Fog Grilles | Clear Corners | HID Kit - low beams & fogs | RCD-510 | Podi Boost gauge | R-Line Pedals | GTI Steering Wheel |

    16. Member DJBeanPole's Avatar
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      02-07-2011 10:02 PM #16
      I seriously hope its not your Forge vinny!

    17. Member slowhatch's Avatar
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      02-08-2011 03:42 PM #17
      I also had a lean fault which the dealership then blamed on my newly installed forge intake. They pretty much refused to do anything about it so i took the car back and did my own trouble shooting.

      Ended up pulling the intake off and really thinking about why i would i be running lean part throttle. The only real simple reason is un metered air past the MAF. I also noticed that there was some oil residue in the inlet elbow of the turbo and realized off bat that the PCV had failed.

      Took the car back to the dealer, told them i want them to replace the PCV and that if the tech hadnt been so pre occupied with aftermarket parts and actually did some thinking/troublshooting on WHY the problem was occuring it would have been obvious. (However, i completely understand the dealerships point on not being keen on aftermarket parts--why waste their money/time troubleshooting other peoples mistakes/bad machining/etc.)

      All in all after they replaced the valve (under warranty i may add) the CEL cleared and all has been right ever since.
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    18. Member Vinnyty's Avatar
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      02-08-2011 04:45 PM #18
      they already replaced the pcv valve but never replaced the orange gasket. I still noticed alot of oil coming from the metal pcv line on the back of the motor to the turbo. this was after the pcv. so i cleaned it up and oil still went through.
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
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    19. Member Vinnyty's Avatar
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      02-08-2011 04:47 PM #19
      Also I returned the car back to stock and getting waaaaaaay better readings now............ I cant imagine an intake causing lean condition. reading about 160-180 g/s on the maf in 2nd at redline. Also idle lambda is 0.8% and lambda mult is 1.6%
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
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    20. Member Vinnyty's Avatar
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      02-08-2011 04:59 PM #20
      here is the link to the vagcom thread ive been posting scans in.

      http://forums.vwvortex.com/showthrea...ean-code-p0171
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
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    21. Member Vinnyty's Avatar
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      02-08-2011 10:52 PM #21
      can anyone explain to me how the forge intake would cause the maf to read so little air flow? I have never had an issue with a intake on any car ive had
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
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    22. Member slowhatch's Avatar
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      02-09-2011 02:10 AM #22
      i really cant see how the intake would be causing a lean condition.

      Lets examine the facts... if your running lean and we assume your fuel system is delivering as promised (hpfp, injectors, cam follower ok, etc) then somewhere between the MAF and the combustion chamber your letting in un-metered air.

      On my car the fact that the pcv had failed (as a check valve its only supposed to open 1 direction so that it cant allow boost to creep back into the crankcase and pressurize the system) and was causing crankcase gases to vent back into the intake tract, which because its located after the MAF was un-metered air and leaning the mixture out. For some reason i suspect that even though you have replaced your pcv that maybe you didnt seat the gasket right, or the gasket is leaking.

      BUT, since you say you put the stock intake in and everything went back to normal, i dont know what to say. It just doesnt make sense. There is no way that Forge unit is causing your AFR to dip unless your MAF is bad. Also examine that last silicone elbow (the one between the maf and the turbo inlet elbow, make sure there are no holes/tears in it.
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    23. Member passatfan2006's Avatar
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      02-09-2011 12:39 PM #23
      Quote Originally Posted by Vinnyty View Post
      Also I returned the car back to stock and getting waaaaaaay better readings now............ I cant imagine an intake causing lean condition. reading about 160-180 g/s on the maf in 2nd at redline. Also idle lambda is 0.8% and lambda mult is 1.6%
      So either there is an issue with the Forge intake or it was not connected right. Is it possble that there is a hairline crack somwhere letting air in!!!

    24. Member slowhatch's Avatar
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      02-09-2011 02:28 PM #24
      So... after getting my issue "resolved" with a new PCV, i am merging on to the freeway today felt a slight hesitation and ANOTHER CEL.. GOD DAMNIT

      I am so sick of taking this thing in to the dealer and being driven around by friends/family. Ive had into the dealer 3 times in the last week, the last time they fixed the PCV they broke both of the intake mounting locations by using an impact to run up the two little baby screws by the front bumper (where the 'ram air' scoop is). So i had to take the car to BARtuning to have them drill out the holes and install spiralocks so that the intake could be secured. Let me tell ya that was real cheap

      Now i gotta go back again.. if its another lean code i dont know wtf else to do except put the factory intake back on. The noise aint worth all this bull****
      2008 Very Viper Orange SRT-10 Coupe | KW V3s | Borla Catback | Interior bits
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    25. Member Vinnyty's Avatar
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      02-09-2011 04:23 PM #25
      Hey you really should notify mike at forge that this is happening. Because he thinks im crazy. Im guessing your car isnt chipped? because mine isnt either.

      I found out that with the 2.5l engine on the jetta and rabbit if you put a cold air in a non chipped car you have to get some sort of insert for the maf. But when they chipped it ran fine.
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
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    26. Member Track5tar's Avatar
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      02-09-2011 05:23 PM #26
      He's on apr stage 1.

      This whole deal is weird tho, the computer should adjust to the maf readings
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    27. Member Vinnyty's Avatar
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      02-09-2011 05:59 PM #27
      I wonder if he has the same maf part number. My car is stock completely now and runs great
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
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    28. Member low_passat's Avatar
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      02-09-2011 06:08 PM #28
      Are you going to put the intake back on? Maybe you just had something a little skewed and by reinstalling it you could prove if it's the intake or not.

      I'm willing to test fit it on my car to see if the same issues pop up if you'd like...

      2007 Candy White/Black Passat 2.0T Wolfsburg Edition| APR Stage 2+ | APR HPFP | Forge WINtake | S3 Intercooler | B&B 3" Turbo-Back Exhaust | Dogbone Insert | FK Silverline+ Coilovers | Front Lip Spoiler/Hi-Def Sideskirts | Votex Trunk Lip Spoiler | R-Line Fog Grilles | Clear Corners | HID Kit - low beams & fogs | RCD-510 | Podi Boost gauge | R-Line Pedals | GTI Steering Wheel |

    29. Member Vinnyty's Avatar
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      02-09-2011 06:14 PM #29
      HA HA HA HA If you lived in new hampshire i would be glad to let you try it. I will prob reinstall it. Im wondering if the cold weather is causing some issues and the amount of air.
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
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    30. Member slowhatch's Avatar
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      02-10-2011 01:03 PM #30
      man im at my witts end with this crap. I have no idea what is going with the car. Yesterday after getting the CEL again, i dropped it off at the dealer and they looked over it again, checked the cam follower, pulled the code( lean again), and then after not finding anything wrong they called me up and asked if i tuned the car first then i put the intake on or vice versa.. i told them it wouldnt matter either which way and they say the car must be tuned with the intake. AKA they dont know wtf is going on. I told them to clear the CEL and id pick the car up.

      Does this car have a LIMP mode? Because as soon as i picked up the CEL its like someone took the boost controller and took me from 18psi to 0. I can barely hear her spool and the power was GONE. Thing is the car still ran smooth/idled smooth just absolutely no power. All of this started happening when the temperatures dip in the low 30s. Both time i got a lean CEL it was like 32 deg outside, dont know if that has anything to do with it but

      AFTER they cleared the CEL and i picked the car up i waited for it to warm up, pulled out on to the feeder got in it and the boost was back Car was back to running like a raped ape again... wanting to blow the tires off from a 2nd gear roll on. WTF is going on.. It ran great like that all last night.

      This morning, get into the car fire it up (its 31 deg outside), wait for it to get to operating temp get into it again, and NOTHING. Wont build boost. Runs smooth as hell all the way to redline but i have no power. I went WOT from a dig in 1st and it kept traction all the way to redline... that doesnt happen, period. When the car was stock it would break loose in 1st past 3k rpm and after the chip 1st gear is useless. **** 2nd gear will flash the traction control all the way to like 50mph. Today i still have not gotten a CEL but the power is gone.

      Does anyone have any idea of what is going? What is responsible for controlling the boost in our cars? Do we have an electronic wastegate or something? Is it all the ECU? How can i have intermittent power like this? I would really appreciate some input here im so My car has been in the shop (dealer and tuner) like 6 times in the last 10 days im so sick of this.
      2008 Very Viper Orange SRT-10 Coupe | KW V3s | Borla Catback | Interior bits
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    31. Member slowhatch's Avatar
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      02-10-2011 03:06 PM #31
      after driving for another couple of miles the CEL is back on again. Car is in "limp mode" i guess. Runs perfectly fine but no power.
      2008 Very Viper Orange SRT-10 Coupe | KW V3s | Borla Catback | Interior bits
      2006 Viper Red SRT-10 Coupe | Gone..
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    32. Member Vinnyty's Avatar
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      02-10-2011 03:26 PM #32
      Your problem is exactly like mine. I told mike at forge that you are having the same issue. Im going to send him my log files when i get a chance of before and after the intake. I am also experiencing this in cold weather. I dont know how it would act in warm weather because we havent had any.

      Can you check the part number and revision on your maf? Im going in to the dealer tomorrow and im going to unplug the maf so it throws a code then plug it back in and see if they will replace it under warranty. That is my last resort.
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
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    33. Member slowhatch's Avatar
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      '08 Viper coupe, '07 Passat (Sport II+ all options),
      02-10-2011 03:32 PM #33
      Yea our problems seem to be identical, and now im really starting to think maybe the intake is to blame. I will tell you this, when i first got the intake the temps where in the 65-75 DEG range and i drove the PISS outa the car when i first got it on just to hear it spool etc and everything ran fine for a good week. It was only when the cold front came in and the temps dipped into the high 20s low 30s that all these lean codes started popping up. Im beginning to suspect that the intake is somehow causing the maf numbers to just overstep their respective 'bounds' momentarily under low temps and trigger a lean code, thus causing the car to jump into limp mode and run like a dog.

      this is pissin me off so bad. I am probably going to drop the car off at BARtuning tomorrow so that they could do diagnostic which they will obviously charge me and arm and a leg for because the dealer pretty much can do nothing for me at this point. FML
      2008 Very Viper Orange SRT-10 Coupe | KW V3s | Borla Catback | Interior bits
      2006 Viper Red SRT-10 Coupe | Gone..
      2007 VW Passat 2.0TFSI Sport II| APR S2+ 23psi | iForged 20s | Full euro inside & out

    34. Member Vinnyty's Avatar
      Join Date
      Mar 19th, 2008
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      Derry, NH
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      2013 Jetta TDI
      02-10-2011 03:52 PM #34
      to be honest with you. if we are having the same exact issue i wouldnt waste your time and money. Switch back to stock and see if that changes it. Also if you can pull out your maf and give me the part number and revision. I wonder if a certain revision is more sensitive then others.
      07 B6 Passat 2.0 turbo - http://unitronic.ca Unitronic Stage 2 HPFP - High flow cat downpipe 3" - ABD Racingwerks intake Stage 2 - HPFPUpgrade.com Stage 1 HPFP - 142 Bar fuel Pressure relief valve - 5 zigen Oil catch tank - Autotech 3" catback - Adams Rotors - H&R Springs teamed with Bilstein Sports.
      http://i51.tinypic.com/153w51g.png

    35. Junior Member MochaVDub's Avatar
      Join Date
      Oct 16th, 2007
      Location
      Atlanta, GA
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      73
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      2007.Passat
      02-10-2011 04:02 PM #35
      Hey guys, after I put on the intake I did get a CEL. Sent it to the dealer and the parts they fixed were covered under my warranty.

      06J-906-051-D
      06E-906-051-K

      Something to do with the fuel pressure?

      I don't want to quote anything, my knowledge of the innards are not as vast as most on here. The tech said both were bad and they replaced the parts.

      The CEL went away, and it comes back on every couple of days or so but goes away. I was thinking it has to do with the fuel tank, cause when I fill up it goes away, but halfway down or near E is comes on?? I will watch closer this time to see when it pops on.

      I don't have the stuff to check to see what code is popping on or off.

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