OEM management wiring: 1.8T => Mk2 harness install FAQ

I suspected it was N249, but it seems to be far too short to reach where the vacuum reservoir sits on the top the engine so was a bit confused… do these sometimes need modification?

…So oil level in the pan can be completely ignored?

by oil sender is that the oil pressure switch single wire? Ty!

 

One more for your expert brain, green and brown with a yellow/black second … any clues?

 

Thank Jonny

 

Thanks so much @rubjonny!

Today I noticed that where the main loom(s) come out the bulkhead that there’s a big connector not plugged into anything- do you think this is a redundant plug and just part of the process of the conversion? Hoping by the colours someone has an idea what it might be but I think that the previous owner left the old loom in there too of some sort. He’s had the car started many times before so from that perspective I’m hoping it’s a dud plug now.

 

@rubjonny Sorry to bring this up again, I’m just struggling to see what to do here. You can see the N249 valve plug here and also see it’s about 10cm long at best. There’s no chance whatsoever it’ll reach across the engine and plug-in up top next to the vacuum reservoir. Do you have any advice for me here? :/

if it does help… my crank sensor in grey seems to be quite long, is it meant to route like this?

 

Interesting- apparently the loom was from an AUM, so maybe that’s why it’s in a different place? I was debating relocating the N249 piping down by the front of the inlet manifold so I could extend the vacuum line to it and then plug it in nicely.

with the “pre cat wide and lambda”, where should I be expecting to find the other end of the connection so I can plug it in? Thank you!!

 

Also another one I’m missing seems to be this thing to the left of the dipstick - I’ve searched for a very long time trying to find what it is!

 

I had a feeling it may have been SAI related given that it’s floating about that area. Is there some kind of list of sensors with their corresponding wire colours so I can leave you in peace? :-) you’re a top man answering my questions I extremely appreciate the help.

with the pre / post cat, I reckon the guy has plugged the pre cat into the post cat one so I’ll check that once on the car. Will the car go into limp mode without a remap and the post cat delete do you know?

 

Okay so just had a look, what do you make of this? It seems the downpipe has a lambda sensor in but it’s plugged into the other connector which has a different shaped end?

 

You’re a legend mate. Ordered a new pre cat lambda. Tyvm

 

New lambda sensor is in - thanks so much @rubjonny! Do you know the file name of what I’m looking for in your signature there’s a mighty list in there!!

 

Just looping back on the oil pressure sensor. Does this give you enough info (you can see where the green wire goes off and joins the loom) to determine if it’s for the sensor or not? I know you mentioned that the green was likely for it based on the loom builder. Ty!!

 

Absolutely nothing just wires… I’ve bought an oil pressure connector for it to fit.