Ive got a full de-cat exhaust for my 94 wrx,what do i do with the lambda sensor and what does it do? cheers dan

You probably haven't disturbed your lambda sensor - I believe it's in the headers on a MY94 WRX...

What you're most likely looking at is the "cat on fire" sensor - it just displays a lamp on the dashboard and doesn't do anything in the ECU, so it's safe to leave it off.

The lambda sensor measures the exhaust gasses to allow a 14.7:1 ratio of air/fuel to be maintained when the ECU is in closed loop mode (ie off boost)

So i can just disconect it and plug the hole in the downpipe? cheers dan

you will waste fuel.

You will be better off running the sensor if you can.

Am surprised that it is in the downpipe as as stated it should be in the headers at the collector on a car of that vintage.

so which sensor is in the downpipe? disconect or not? cheers dan

As dnb says, its the 'cat on fire' sensor for a car of that age.

If you've got no cat, there's not a whole lot of point in connecting it to the downpipe. ;)

[Edited by Goldeneye - 10/18/2003 7:38:56 PM]

Sounds good 2 me mate, cheers guys for the help. dan