This is my van that has the problem. Just moved house so I have no internet. There where other faults but we cleared these before taking it for a spin. These ones stayed. I've changed the maf and the n75 & n18 pipes as they looked dodgy. The n18 was replaced before I got the van. I've tried unplugging the maf to see if there is any difference in power. There isn't. Does this mean the maf or wiring/plug is the problem?
Ok so I've no idea what the problem is and when searching on here (like most things on the internet) I get all sorts of problems relating to low boost. So I've changed the 109 relay (with no difference) went to volkswagen today and ordered a map sensor. I'm leaving no stone unturned. We'll see what Wednesday brings.......
hi,not sure if this is any help but ive recently replaced my cat with one from T4s r us
and made a hell of a difference, also stuck a tub of STP diesel cleaner into a full tank of fuel- expensive but i can already feal the difference! good luckT:T:
with both these codes present boost will be limited by the ECU to protect the engine.
most likley cause of failure is 2 open circuits in the wiring between the ECU and the components identified by the fault codes.
engine harness is pretty tight in the engine loom and harness breaks are not uncommon on these vans.
undertray off, (i think the start valve is pump mounted, and used to time commence of injection) whilst MAF is next to intake air box top LH side engine bay. Circuit diagrams and a multimeter with the components disconnected and the ECU disconnected, using wire colour coding / pin numbers on ECU and components check for continuity along each wire and also for short to GND, VBatt (make sure ECU disconnected and battery disconnected).
Open circuit most likely fault.
Short to GND via block next possible.
Least probable is short to Vbatt or 5v ref voltage.
otherwise decent auto electricial who is familiar with VW engines.
Fixed! Thanks to nwilko for the advice. Did as you said and stared checking though it wasn't long before I had the under tray off and went to check the start valve and there is was. The brown wire has broken completely A:
Had a bit of a panic when I tried to start it again tho. It started but only rev'd to 15000. I only took the negitave off the battery. Turns of once I took the positive off and all back together she fired up and she's back to her old self!