sensor help please ?

[madmark]

hi can anybody tell me the correct name for the sensor which screws in to the cat on a evo 4 and what it does as my evo had been decated and its mot is due so have bolted the cat back on but may need to replace this sensor is there any way of testing if its working ok ? thank you reason i ask is with the decat pipe on the car it was not conected it was just tie cliped out the way with no dash lights showing fault so how do i know if its working now its all back together as it should be

 

[B6lee]

It's probably just an aftermarket exhaust gas temp sensor cos the lamda sensor is up by the turbo

 

[madmark]

i dont think its a after market sensor i have looked at a new cat on the net and it has the fixing for this sensor to go in so it must be there for a reason ? thank you for the reply anyone know what it is and what it does also can it be tested ?

 

[B6lee]

most aftermarket decat pipes come with a boss to fit a lamda probe but this is purly for mapping purposes. the cars only got one lamda and its fitted into the turbo elbow which is before the downpipe and way before the cat. as long as your cat is fitted then youll be fine.
also some stations will turn a blind eye to emissions testing evos and other tuned cars as the law states emissions is only at time of test anyway


here is a pic of a evo lamda

 

[sponners]

thats the 'cat on fire' sensor mate, won't be needed for the mot.

 

[madmark]

this is good news to my ears thank you all the cat is back on the car untill mot is done then off it comes again cheers all and merry christmas to you all

 

[GG205rob]

You won't need the cat on a 4 anyway. Theyre not type approved and vosa dont hold any emissions data for them so they should be tested as non cats.

 

[Steve220]

You won't need the cat on a 4 anyway. Theyre not type approved and vosa dont hold any emissions data for them so they should be tested as non cats.

Thats changed. They are now tested on the base figure, cat fitted.

 

[GG205rob]

Fair enough. I didnt know it had changed.
Do they now go off the production date wether it should have a cat fitted then?

 

[Steve220]

Anything after 1994 gets checked and as of next year, it must also have the cat present in the exhaust system.

 

[madmark]

i have refitted the cat just wanted to know what the sensor was now i know thanks to members on the site thank you to all