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austin man - 17/2/09 at 09:56 PM

VAG com error codes

I have a 1.8 golf turbo just got the following error codes 17608 Boost pressure control vale (N429) Mechanical malfunction

17705 pressure drop between turbo and throttle valve(check D.V!)

17545 Fuel trim bank 1 (add) system too lean


can anyone help me out with what it means and a solution

McLannahan - 17/2/09 at 10:34 PM

http://uk-mkivs.net/forums/p/247434/1603390.aspx#1603390

Really good forum for MK4's. Loads of help there.

roadrunner - 17/2/09 at 10:55 PM

That ones added to my favorites.

austin man - 17/2/09 at 11:22 PM

do I take it that the boost valve is also known as the dump valve ??? I gave this info to VW at the weekend and they where confused, if its a simple dumpvale then Ill just buy another just dont fancy running the car into VW

McLannahan - 17/2/09 at 11:37 PM

No, I believe the valve operates the dump valve - telling it when to open and when to close.

There's a few DV's you can get. H and J I think are the more popular ones (I think from an Audi TT??) and I'd replace this first and then if this isn't fixed then the boost valve.

This post will help you identify the parts!

http://uk-mkivs.net/forums/p/213950/1381524.aspx#1381524

t16turbotone - 18/2/09 at 07:44 AM

I would carefully check intake hoses, i had this problem and it was a split in one of the hoses

matt_claydon - 18/2/09 at 08:06 AM

The boost valve operates the wastegate which controls boost pressure.

A dump valve (or a recirculation valve if you're not a chav) opens when there is an overpressure due to closing the throttle when the turbo is still spinning fast and usually has no electronic control as far as I know.

britishtrident - 18/2/09 at 08:53 AM

Sounds as if it needs a clean, free off and check all the hoses.

pocket rocket - 18/2/09 at 06:01 PM

A dump valve (or a recirculation valve if you're not a chav) ...

hey thats a bit harsh... i had a dv on my last car and im no chav!!!

Meeerrrk - 18/2/09 at 06:02 PM

quote:
Originally posted by austin man
VAG com error codes

I have a 1.8 golf turbo just got the following error codes 17608 Boost pressure control vale (N429) Mechanical malfunction

17705 pressure drop between turbo and throttle valve(check D.V!)

17545 Fuel trim bank 1 (add) system too lean


can anyone help me out with what it means and a solution


hi, these are all common 20vT fault codes.

N249 is a pain in the a55, i always disconnect them when i run 20vT engines, regardless of car application. basically it allows the ECU to control the dv at any throttle position, including full throttle. It maybe that your dv diaphram is split so the n249 cant control it, so it thinks the n249 has failed.

Pressure drop (check d.v) could well be your re-circ valve (also know as dump/diverter valve & dv) diaphram split, it is very common on the OEM part. the forge 007p is a far superior item. Again, always fit one on 20vT engines regardless.

Sounds like you need to remove your throttle body, clean it out, refit and reset your throttle position (done on vag com) that is if its a DBW. If its cable throttle then you dont need to/cant reset the throttle position. Once again, something i always do when i purchase a car with 20vT engine & try to do it once a year too.

regards

Mark



[Edited on 18/2/09 by Meeerrrk]