Code P0171 comes on every time
How can I fixed it or trace the leak
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The general consensus seems to be that code is usually tied to a vacuum leak somewhere in the system, as you seem to have surmised already. When I've run into that, my troubleshooting consisted of examining all of the vacuum hoses for disconnected or cracked lines, along with any of the bellows and hoses that connect the MAF to the intake manifold. Don't forget the brake booster that runs on vacuum either.
The professionals use a smoke machine that is hooked up to the MAF and blows smoke into the engine. Any leaks quickly become obvious when the black smoke comes out the place that's causing the problem.
You might try some of the VW forums like VW Vortex and search up vacuum leaks to find out where people are finding them and how they fix them.
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@dadibrokeit I use some starting fluid spray to find my vacuum leaks. With the engine running I spray a few puffs on the vacuum lines. Once the engine start to increase its revolution (or runs smoother etc.) I know I found the leak :-)
You know, old people stuff and cheaper than a smoke machine :-)
@oldturkey03 Glad to have backup when my brain refuses to bring forward stuff I know perfectly well. :)
Brake clean works too, in a pinch. I imagine hairspray would probably work as long as it's flammable, although I don't think I'd relish the thought of spraying hairspray all over my engine.
