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turbo boost problem

1490 Views 2 Replies 3 Participants Last post by  chittychittybangbang
have a 03tdi 130 bhp passat showing a p code p1557
should i just change hole turbo or try n75 and vnt first ???:eek
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Check the vacuum lines and VNT actuator first, they are much cheaper. Take a look at this article http://www.myturbodiesel.com/1000q/a4/VNT-wastegate-adjust.htm and isolate the problem.

If you isolate the problem to sticky vanes and don't feel like taking it apart, then you can buy a new turbo. No point in replacing the whole turbo if it only needs a new actuator.

RE: gra900, get error codes first. If EGR-N75 swap fixes it, you found the problem. Also check all vac lines, very common problem. See the limp mode FAQ article, it has more troubleshooting steps.
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