Is my lambda sensor in my downpipe [decat] on my93 wrx, If so why is the thread much smaller than normal, or is it something else, 2 terminals silver braided cover connects under the boost solenoid. the probe is narrowtapering off and the plug is round with 2 spades inside . it is in the bottom of the downpipe ? any ideas

 

I think thats the EGT sensor. Some of the earlier WRX seem to have these for some reason. Is yours an RA ?

Your lambda will be in the header/manifold

 

its not a ra just a wrx . Is that on the r/h side under the front ?

 

Yes. The small sensor you have found is the "cat on fire sensor"

Just unplug it if you're putting on a decat downpipe.

MB

 

Is the light on the dash next to the cel it looks like an exhaust with small dashes above it the cat on fire warning light . as it has been flashing and the car has not been starting , until the 10 min flashing has finished ?

 

Yep.

MB

 

Yes,this is the exhaust gas temperature sensor light (the part fitted to the down pipe that you mention is this sensor,not the lambda.)

I have not tried disconnecting this on a wrx but I have on a crx and it didnt make a differeence.

In some cases you can put a resistor to it which will fool the ecu into thinking that the temperature is ok,but I havent done this myself.

 

What I said then

MB

 

Just disconnect and forget.

 

woops

wasnt reading carefully




Yes as DBM says

 

Just pulling your leg

MB