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Discussion Starter · #1 ·
Hello all,

I just got a 2005 GTI 1.8t and I'm experiencing some CEL problems. I'm getting the code P0171: system too lean (bank1) from what I understand it is most likely my MAF or a vacuum leak right? I don't even know where to start to look for the leak because this is my first car. Can you please tell me what these readings mean and how I can check these problems? I really want to learn this car inside and out. Thanks for your time.



Car at idol
ODO reads

P0171 system too lean
Fuel sys 1 CL
Fuel sys 2 NA
Calc Load(%) 27.8
ECT(F) 171
STFT (B1)(%) 0.0
LTFT (B1)(%) -9.4
Eng RPM 760
Veh Speed 0
 

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Discussion Starter · #3 ·
Like I know what the code means and what might be wrong, but where should I start looking in my car for the leak? There are so many hoses for an inexperienced VW owner like myself.
 

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12,563 Posts
Ross tech provides a list of problems, from most likely to least. I'd run down that list and check each one off as you inspect it.
 

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8,222 Posts
It's probably just a bad o2 sensor. The front sensor.

Sent from my SAMSUNG-SGH-I727 using Tapatalk 2
 
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