scoobynewblood

HELP!!!!!!!!!!!! can anyone out there thats de-cat an exhaust on a 96 scooby please tell me if the sensor that is normally below the cat is a temperature or oxygen sensor? and if this needs to be reinstated into the de-cat pipe

Tidgy

isn't it the lambda sensor?

scoobynewblood

no apparently on my engine the lamba sensor is in the engine compartment

Tidgy

do you mean on the bottom of the downpipe?

scoobynewblood

no, if you are under the car where the turbo and pipe are connected just below the original cat there was a sensor into the pipe where as the decat pipe has no cat im not sure what this sensor is

Tidgy

only cats in a classic are in the downpipe and centre section, so must be lambda, unless your telling me the wrong place/pipe lol

scoobynewblood

hi tidgy, i prob got it wrong .does it make a difference mine being a jap import? i was told by a guy who had a scooby that my lamba sensor was by the abs box under the bonnet and that the sensor into the downpipe was just an oxygen sensor, who knows? i just dont want to hurt the engine if this sensor is supposed to be in.

Tidgy

um, wonder if i've got it wrong then lol

was pretty sure it was the lambda in the downpipe though

scoobynewblood

Never mind ill find out eventually, the engine will blow up or it wont lol.

ralphandcarol

You have all got it wrong.
The Lamda on a 96 car is basically in the up-pipe near the manifolds.

Tidgy

so what is the seonsor in the down pipe?

rmtypeR

I don't know what the sensor is but when Hayward and Scott fitted my decat downpipe they left it disconnected. Last weekend I put my original downpipe back on and was a little confused as to where the wire hanging out of it plugged back in! Found it in the end though.

waggy doo

iTrader: (1)

i have a MY96WRX i fitted full decat HKS Hyper and the down pipe had a threaded hole for me to put the sensor back into.
If you dont fit the sensor you will get check engine light all the time.

rmtypeR

The threaded hole at the top of the pipe is for what (I think) is the Lambda sensor. But there's also a 18" long wire with a 2 pin plug on the end coming out at the bottom of the cat. I think the original question refers to this second wire.

andrewwhitcombe

Lambda sensor is on the down pipe. It measures the exhaust gases to see if its running to lean or to rich.

Gear Head

iTrader: (2)

The one at the top of the downpipe is the lambda sensor. The one towards the bottom of downpipe, is the 'cat-fire' sensor, which is obviously not needed when you decat.

Tidgy

ahhh thought there was a second sensor involved that gets blocked off after decat lol