UK-POLOS.NET - THE VW Polo Forum

im trying to connect my lambda sensor wiring from the manifold, to the lambda wiring after the cat. Can anybody tell me wich wires to connect to between the two sets of witres? These are the wires coming from each sensor

After cat: white, white, black, grey
Manifold; Red, yellow, black,grey, white

thanks

Ive just got my raceland manifold through the post today. M9 already has a place for the lambda sensor to screw into, doesnt yourz already have this? Also my second pipe that you get with the manifold is already bent downwards. Is this the pipe that needed bendin in the first place?

N i dont think you should connect the wiring to the one after the cat as that was specifically placed before the cat, so oxygen levels will be totally different so it would be getting wierd readings which probably would mess up your engine. I think you should place it before the cat where it should be!

Yeh i thought all that was involved was to lengthen the wiring for the manifold cat?

NFS, where did you purchase yours from?

I got mine off ebay for £140 delivered from Belgium. Took abit of negotiatin but the seller finally agreed to do it for £140!!

i think its the section that goes into the 2 pipes that runs next to the gearbox that had to be bent. Nope mine doesnt have a bit for the sensor.

Also ive got a de-cat so would it still matter if i connected the two sensors? if i just left the one aftre the cat, what would i do with the other one/ just leave it tied up?

Good question, I'm not sure what you do with a de-cat when it comes to Lambdas. PM Ross (rossco) on here, he's got a decat.

ive got the lambda senor in, that comes in where the cat should have been. it was added in to my de-cat pipe. just the manifold one im stuck with

Cant you create a place for it to go?

Drill a hole through the end (straight piece) of the manifold and weld a nut to it for the Lambda sensor to screw into?

My decat has been done the same way basicly, failing that just leave it out and cable tie it to an exhaust mount! lol

Rossco wrote:Cant you create a place for it to go?

Drill a hole through the end (straight piece) of the manifold and weld a nut to it for the Lambda sensor to screw into?

My decat has been done the same way basicly, failing that just leave it out and cable tie it to an exhaust mount! lol

So are you still running both lambda sensors then Ross?

I thought one would trip out without the cat there, and the same effect if it was just removed!

would it make any difference by leaving it out, rather than putting it back in?

Im still running both yeah mate.

I get the odd engine management kight on, but goes off within a few hours and the VAG-COM just explains it as lambda sensor fault.

If you leave it out i dont think it will effect it, might say its running to lean as opposed to rich though?

Rossco wrote:Im still running both yeah mate.

I get the odd engine management kight on, but goes off within a few hours and the VAG-COM just explains it as lambda sensor fault.

If you leave it out i dont think it will effect it, might say its running to lean as opposed to rich though?

Like Rossco sed if you leave it out the ecu will think its runnin to lean so will compensate for it by injecting more fuel than it acutally needs, so the combustion will not be done completely as all the fuel will not be burnt so basically petrol will enter your exhaust. To be on the safe side i would put the lambda sensor back in, wunt cost much!