I didn't not have a check engine light but decided to check the codes / vacuum. Sure enough there was a pending p0507 (Idle past threshold) and then a few minutes later a p0171 (system too lean bank 1).
The odd thing was it would only idle high once the engine warmed up. Everyone was saying check all the hoses, pcv valve, oil cap, etc. I did notice the oil cap was super hard to take off. Finally I put on a new pcv valve and problem solved! Took about 10 minutes with a torx screwdriver, pliers, and a flat head to remove hoses.
I was wondering what exactly was broken in the valve. Blowing into the valve would shut off air flow, so I thought it was working. That just cuts off psi from entering the crankcase from the pressurize intake (turbo building pressure). Little did I know it was leaking from the other side of the valve. You can very easily take off the round top with a flat head screw driver and verify if the rubber is fully intact. Mine was torn in two different locations.
My old valve was a 06F129101N and the newest revision from Audi was a 06F129101R. The newest revision replaces all of these 06F129101L, 06F129101C, 06F129101N, 06F129101F, 06F129101K. Looking at the date code on the top it was stamped 23411 (234th day of 2011). This means the part has about 5 years of service. So I'd highly recommend replacing every 5 years as a maintenance item. Heck you could just switch out the diaphragm or duct tape the cracks to get home with nothing but a flat head screw driver.
Hope this helps someone!
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Originally Posted by drmonkey
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