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Hatchbacks Volkswagen Beetle Volkswagen Beetle Maintenance and Repair
1064 messages, Last post on Nov 03, 2009 at 5:45 PM
You are in the Volkswagen Beetle Forum. Your Host is pf_flyer
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Replying to: brut4orce (Sep 08, 2009 5:10 pm) 16555 P0171 Fuel Trim,Bank1 System too Lean You asked for more details... here is some technical stuff... =======start technical stuff ======================= Your ECM has a memory look up table that tells how long the fuel injectors SHOULD be open, to give correct air-fuel. The Oxygen sensor monitors the exhaust to tell how incorrect the table is. The table is programmed when the car is new and everything works fine. As the car gets old you may have wear & tear and things vacuum leaks, etc. This causes the table to be off. THe O2 sensor tells the ECM how to tweak the fuel injectors back to give the correct air-fuel. Basically, the car learns how to correct the table for the current running condition of the engine. In your case the ECM (with O2 sensor) has determined that it has used up its entire fuel injector tweak-tuning range for correct air-fuel. You're running too lean and the car can't add enough fuel to bring the air-fuel back into range. Your either getting too much unmeasured air (air coming in besides through the MAF sensor) or you're not getting enough fuel pressure. That, or the MAF is measuring the incoming air incorrectly. ========end technical stuff============= The dealership replaced both of the most-likely (and most expensive) components which could cause this failure. (Keep in mind that a NEW part is not always a GOOD part.) If I were you, I would inspect ALL the vacuum hoses for cracks/leaks. If air is getting sucked in where it is not supposed to, this error could show up. There is an outside chance that low fuel pressure or whimpy fuel injector could cause this too. I also have to say that a TURBOCHARGED engine has some other possible items that can cause this. (you do have the 1.8T!)
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Replying to: brut4orce (Aug 31, 2009 4:55 pm) I am no longer using any vw dealers. The problem I was having, was when the engine was droping below 2000 rpm, the transmission was droping out of gear and the rpm was increasing. I was taking the car to 55 mph and allowing it to slow on its own to 45 mph, the transmission would start to drop out. Take your bug to a local transmission shop and have the fluid replaced at least on a 25K basic. dealer are of no help! |
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Replying to: brut4orce (Sep 08, 2009 5:10 pm)  . So for your sensor recurrence issue, it is actually quite common on a lot of vehicles. Sometimes your vehicle will have a code for a certain sensor having a problem the normal fix is to replace the sensor then flush out the fluid if the code comes back your transmission is probably coming apart internally and generating debris from some component. Good Luck! 
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I was wondering if replacing or rebuilding the transmission on an 03 Beetle solved the problems of slipping or not having a gear after 2nd (going into limp mode). Thanks Guys! 
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Oh my god. I can't believe how much I am being told it will cost to replace a headlight. A half hour labor and a $20 part on top of the headlight. I can't believe it. I have never had a car where my auto parts place wouldn't put it in for free when I bought the bulb there. Love the car, hate the headlight changing. One poor design.
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Replying to: keygo (Sep 24, 2009 2:46 pm) Most people dont know this is how the headlight bulbs in the NB are replaced. It is a BRILLANT design given the lack of space under the hood to put your hands to replace the bulbs.
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Replying to: bpeebles (Sep 24, 2009 5:14 pm)
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Replying to: keygo (Sep 25, 2009 9:08 am) By the time the dealership takes their cut from that... the guy that worked on your car takes home somewaht less than the $35 you paid. He has a family to feed and bills to pay just like the rest of us. Personally - I purchase a replacement bulb at wallymart and replace it myself in the wallymart parking-lot. I also replace my own oil, brakes and do most other repairs. I cannot afford the $70/hour for those tasks. |
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I am in a big dispute with our after market oil quick change store. I developed an oil leak and took it to our Car shop in Brighton Mi. Perfect Tune, (good place). They told me the leak was coming from the filter. I told them to replace as it was getting close to an oil change any way. When they removed the oil pan drain plug it was way over torque and difficult to remove. It bvacked out and pulled oil pan threads with it. They tried to over size it and use a bigger plug but the boss on the pan is almost flush with the inside of the pan structure. They had to replace the pan (435.00). I called the VW dealer and they said their standard repair process was to replace the pan. Does anyone have any expirence with oversized the drain plug hole???? Thanks......
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