ive just put a new down pipe on and i'm stuck, the senser at the bottom is stuck in the old down pipe and i need to get a new one, if anyone knows what it is called i would be most greatfull

 

Lambda probe/ Oxygen Sensor i'd use a little heat to get it out mate as they aren't cheap. Mine was £320. :-(

 

this might sound thick but what does the lamdba probe do, and is that the top or bottom one, thanks for your help

 

what car u got? normally there is 2 sensors, one in manifold uppipe which is lamba and one in downpipe which is O2. it measures your exhaust emissions and alters the air fuel mixture if you are running too rich or lean. if one goes then your emissions will go threw the roof.

 

are you sure its not the cat on fire sensor? about half the size of the normal lambda sensor, just a thought

 

whatever you do, dont use wd40 or release agent to get it out, it f*cked mine completely and i found out later it was thew wd40 that screwed it. A new one costs £140 +vat for a 99, i got a uni part instead for £35....hmmm.

 

there is a thin senser is just below the cat and a normal size senser at the top of the neck, but both are on the down pipe, i have just fitted a new decat down pipe, would it do anything if i dont fit the thin senser???

 

no just disconnect it its only there to tell you cat is on fire but if you dont have a cat it cant catch on fire

 

far one mate cheers for all your help