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  1. Diverter Valve and Running Lean

    Volkswagen Passat B5 Discussion
    I have a 2001 B5 Passat that I am constantly working on. I have not yet aquired a Vag-com scanner but I have had the codes ran several times and it keeps showing that I am running lean. I have changed the diverter valve out for a 2002 diverter valve that is supposed to be a "bigger and better."...
  2. Lean Engine and hissing sound

    Volkswagen Passat B5 Discussion
    Recently I have gotten the P0171 and P0174 codes, which leads me to believe either the MAF sensor is dirty, or there's a vacuum leak. Maybe to O2 sensors, but I'm not too sure about that. So far what I have tried has been listening for air leaks and disconnecting the MAF Sensor. I do hear a...
  3. Bank 1 System Too Lean P0171

    Volkswagen Passat B5 Discussion
    I am receiving the P0171 CEL code with Bank 1 System too Lean. The car runs completely fine, no misfires and no rough idle. DEQ gave me a print out of their diagnostics which is as followed: misfire- ready fuel system- ready component- ready catalyst- ready catalyst heater- unsupported...
  4. Help diagnosing lean misfire

    Volkswagen Passat B5 Discussion
    I had this other thread about identifying a leaking hose, I got that fixed so now I am starting a more specific thread. I have a 2001 B5.5 2.0L AZM engine. So suddenly it started shaking a lot at idle and VAG-COM gives the system too lean and random/multiple misfires, also misfire codes on all...
  5. 2010 CC 2.0T - code 008583 - Bank 1; System too Lean at Idle - P2187 - Intermittent

    Volkswagen Passat CC Discussion
    Not sure what my engine code is (EA880 or so? Or another 3 letter code)? What might cause the 'system lean at idle' code? How to troubleshoot?
  6. P1128 Fuel Trim System too Lean Caused by Exhaust Leak??

    Volkswagen Passat B5 Discussion
    I've been having a CEL come on and off for a few months with no noticeable drivability issues. Problem is, NYS inspection is here and I need this fixed. The CEL is from a P1128 too lean code. I've cleaned the MAF (it looked fine, no real dirt but I sprayed it down real good anyways), and the...
  7. Lean and rich codes

    B5 Garage
    Friends car has been acting up scanned it with vag-com, i think its the first o2 sensor as the maf was just replaced, what are your thoughts. It's a b5.5 awm VAG-COM Version: Release 409.1-US Chassis Type: 3B - VW Passat B5 Scan: 01,02,03,08,15,16,17,19,35,36,37,46,55,56,57,58,76...
  8. Another Lean Condition...17519 code

    Volkswagen Passat B5 Discussion
    Last fall I had an overboost problem and I found a bad DV and a leak on my 05 1.8T Now, the CEL comes on and I get these codes: Address 01: Engine Labels: 06B-906-018-AWM.clb Control Module Part Number: 4B0 906 018 DQ HW: Component and/or Version: 1.8L...
  9. P0171 and P0174, idles and runs fine, System too lean, help!

    Volkswagen Passat B5 Discussion
    Engine: V6 Mileage: 117k Synthetic oil, Removed Intake plastic cover and after market intake K&N 69-9756TFK. Replaced timing belt, serpentine belt and water pump. The car runs and idles great, I cleared the codes with obd2 plug in and traveled around 200 miles on the interstate, as soon as I...
  10. Vacuum line left out in every thread.

    Volkswagen Passat B5 Discussion
    Hey guys, I was driving around today enjoying my exhaust drone and my thoughts began to ponder about my emissions when suddenly I realized that after like a year when I had changed my vacuum lines to silicone ones. I remembered that one line that runs behind the intake manifold which was torn...
  11. Lean misfire fixed

    Volkswagen Passat B5 Discussion
    For what its worth, I would like to share this story. Last year i started having a misfire on my 02 GLX sedan v6. The timing belt was changed less then 10k miles agon. So the first thing I do is go borrow a friends code reader. I pulled 1 code, P0442, which is EVAP very small leak. The...
  12. misfire and lean engine codes in 04 Passat Wagon

    Volkswagen Passat B5 Discussion
    I've been the only owner of a 2004 Passat Wagon, GLS, 4motion, manual transmission with 130k miles. A privately owned repair shop specializing in VW and Audi has done an amazing job of keeping the car running well. The engine light has been on for a few months (the car seemed to be running well...
  13. Chasing Lean Fuel mixture (DTC 17748 and 17536) with a twist and stumped

    B5 Garage
    I am new at this but learning quickly as my Passat ages and thanks to everyone at PW. Car is a 2001 Passat 1.8T GLS AWD manufactured 6/2001 with engine AUG and no mods I am aware of. Check engine light on and emissions workshop (red signal) goes off every time I leave the driveway and reach...
  14. CEL - P1136 Fuel Trim: Bank 1 (Add): System too Lean

    Volkswagen Passat B5 Discussion
    So I was driving my Passat a few weeks ago and came to a stop light. While sitting the CEL came on. It was a warm day (around 95) so I couldn't see any error messages on the display. I got home and read the codes using VCDS Light and got the above mentioned code. I cleared the code and continued...
  15. Running Lean Help?

    Volkswagen Passat B5 Discussion
    This is my second set of plugs within 6k miles gapped correctly. I have been pulling them out to check how my motor is doing and it appears that I might be running lean and I cant figure out why? Do these plugs look normal after about 2k miles. The plugs in the pic are BKR6E on a 1999 AEB. Last...
  16. Vacuum hose,Lean Code, Turbo help

    Volkswagen Passat B5 Discussion
    The vacuum hose that goes around the front of the engine and down i guess into the turbo looks frayed and bad. Could that vacuum hose be leading to a lean code, cylinder misfire and the turbo wastegate rattling when accelerating? I will try to attach a picture of part of the frayed hose.
  17. P0171 Lean Code Help

    Volkswagen Passat B5 Discussion
    I posted this picture I took yesterday in another post I did about a rattling sound while acccelerating. Could these small holes in the plastic piece be causing the Lean Code? I would think it would be something more. What is this piece called? Air intake? Thanks Joebob
  18. Running lean?

    B5 Garage
    Hey guys my passats been running lean put a test pipe on and spaced out 02 and still smells like its running lean and the plugs where whitish what could be the problem ??
  19. PO171 Bank 1 too lean

    Volkswagen Passat B5 Discussion
    I have a 2001.5 Passat with 1.8t that is throwing this PO171 code and I can't figure out what is wrong. I've checked all my vacumm lines, my maf sensor seemed to be clean, and my o2 sensor seem to be good. The engine light usually comes on about once a day and after I turn the light off it runs...
  20. Cylinder Misfires and system too lean. Causes???

    B5 Garage
    Hey everyone. So I have a 2002 Volkswagen Passat 1.8L turbo with four cylinders. It has 160,000 miles and I just bought it a few months ago. The prior owners took wonderful care of it and the carfax shows every single time they took it to the dealership to get maintainence which was all the...
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