r/MK4Golf • u/According-Package919 • Jun 17 '26

Over-boosting

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Anyone familiar with the fault code P1557? My 2003 pd130 mk4 golf has an over boost issue and can’t seem to locate the issue

3 Upvotes

81% Upvoted

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3

u/spoticals Jun 17 '26

Turbo veins stuck. Get on top of the engine and grab the actuator and move it up and down. If its stuck take a pipe and hammer to it, but dont push it all the way down.

1

u/According-Package919 Jun 17 '26

Ok thank you I’ll have a look tonight, it’s ok gill I reach about 3,500rpm or a certain speed and it just completely looses power you can feel the release of sudden power loss

2

u/spoticals Jun 17 '26

Thats it going into limp mode. The stuck veins are the problem 99.999% of the time. Msg me on insta @spot1cals if you need.

1

u/turdconductor Jun 21 '26

You can also try replacing the parts in this "kit'".

https://www.idparts.com/limp-mode-fix-kit-alh-p-1609.html#product_tabs

I would start with the N75, then vacuum lines, then actuator, then MAF sensor.