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  1. Volkswagen Passat B5 Discussion
    Ive got a hot start problem w my 03 1.8L. Intermitten, cranks but starts only w lots of coaxing followed by noxious smell. Coolant temp sensor? Also: turbo underboost fail: could this be the hot start prob? Is it the culprit w the hot start? Im new to this, is there a diagnostic that could give...
  2. New Member Introductions
    Hi. Thanks for all the helpful info you all provide! I Bought a very reasonably priced 03 passat 1.8 ( high miles, great shape). Runs great, when it runs. Hot start issue: starter is fine, just doesn't want to turn over unless i floor the accelerator, followed by a lot of fumes. The diagnostic...
  3. B5 Garage
    Hi I have a 2005 1.8T GLS Wagon that just stopped running yesterday. My wife and I are moving about 2 hours away and were driving to a storage unit. I had noticed it started having trouble accelerating about half an hour before we arrived, and when I put it in park at the storage unit the...
  4. B5 Garage
    Hi all! I have a 2005 Passat wagon I bought last spring (90k on the clock). Since then, I have been battling with an endless limp mode struggle. I have made some ground on the limp mode and my car is somewhat driveable but the limp mode still rears it's ugly head about half the time I drive...
  5. Volkswagen Passat B5 Discussion
    Today was hot and humid, son tells me the CEL came on while driving, symptoms were lower power than normal. Scanned it and got the P0299 for underboost condition. The inlet air pipe is solid, no other signs of air pipes loose. Backstory: Got the 2004 GLS 1.8T emission tested last Thursday, it...
  6. B5 Garage
    Hey guys, I just replaced the turbo in my 2005 AWM Passat with a remanufactured Borg Warner. I checked the vacuum system for leaks and it seems to be tight, but I'm still not getting acceleration! It was having trouble getting past 60, and got the code for Turbo Underboost. I really don't...
  7. B6 Garage
    Well, I have been battling a series of DTCs pointing towards Underboost and Too Lean conditions. In my vast amount of spare time between work and family, I need to figure out how to best tackle the problem(s). The 06 Passat 2.0T had a PCV "upgrade" as per the TSB from VW last year so I would...
  8. Volkswagen Passat B5 Discussion
    2005 Passat 1.8t AWM Ive got P0172 Bank 1 System too Rich as well as P0299 - Turbo Underboost I have checked my MAF which seems to be working (idles fine when connected, misfires when disconnected). I may have a slight vacuum leak somewhere as I can hear a slight hiss when laying on the motor...
  9. B6 Garage
    2007 2.0 wagon with a little over 90k. I have a reoccurring CEL with a code P0299 - Underboost. Each of the 4 times it has happened have been accelerating onto the highway at speed of about 78mph and rpm of 23-2400. So far I have checked all hose connections to verify they were tight and...
  10. B6 Garage
    Hi All, I've got two error codes that are persistant. The underboost code will be fixed (I HOPE) when I replace the diverter valve which is currently sitting in my trunk. But I'm getting a persistently intermittent P0303. Here's whats going on: Some mornings, I can start the car and get a...
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