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I hope someone can help me with my problem. First of all, I need to say I'm pretty inept mechanically, so keep that in mind :)

My check engine light came on a while back and I took it to Autozone to see what the code was. I'm pretty sure the code was P0101, but I'll have to check again to be sure. I do remember for certain it said "bank one too lean." From what I've read, that means there's too much oxygen getting into the first cylinder.

The car runs fine except right after it rains; the engine sputters and misfires for a bit, including a blinking check engine light, but then stops and runs like normal after just a few seconds. I've checked for a vacuum leak, but I couldn't find anything... I've read a lot about the MAF sensor possible being dirty or going out, but could that have anything to do with water seemingly getting into the engine?

I don't really know where to begin or what to do and I don't have the money for a mechanic right now, so could anyone give me some advice on where to start?
 

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Hey, it would be a good idea to have a vw specific scan tool; that way, we know the codes you are getting. These codes can point you in a direction; to help you in your troubleshooting process. They have inexpensive code readers on Amazon; for less then $50 (e.g. U281 or VAS 450); the more expensive option that read live data (Foxwell Pro VW scanner $200) or the factory level scan tool VCDS from Ross Tech. If you can post the codes you are getting; we will do our best to help. As you know; you can have your car scanned for free at most auto parts stores like Autozone.

http://www.amazon.com/s/ref=nb_sb_n...s=Vag+scan+tool&rh=n:15684181,k:Vag+scan+tool

http://www.ecstuning.com/News/Volks...2007_2008_2009_2010_2011_2012_2013_2014_2015/

http://store.ross-tech.com/shop/cat/VCDS.html


One thing that comes to mind; the 2.0l can develop cracks in the coil and this can make the engine run badly and misfire when wet. So that might be something to check; many people have sprayed water around the coil and if it makes the engine misfire and run badly, then that is a pretty good indication, the is the problem. Remove the coil and check for cracks.




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If the SES/CEL/MIL comes on, you do not need a manufacturer specific OBDII tool.

A smart phone App and interface for $30 or less is a very good place to start.

See the info in my signature regarding OBDII tools.

If the SES/CEL/MIL blinks, this usually indicates misfiring.

If you have issues when it rains, you have a 2.0l then I would replace the coil and wires to start with. This assumes the plugs are good, may need to replace the plugs as well if you do not know what shape they are in.
 
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