lambda sensor

Hi I'm having issues with emissions for MOT and I'm pretty sure it's a lambda sensor issue I just need to know if the pre and post lambda sensors are the same or different?

Hey guys! My engine management light (EML) came on a couple of months back so I took the car to my local garage (the place I usually take it for servicing, MOT's etc.) to have it looked at and there seems to be a problem which has something to do with the lambda sensor. At first we thought it...