Quick question about Lambda Sensors

[joesmith]

So, I need the 2 Lambda sensors on my car replaced along with the cat.

It's a mk1 2000 Ford Focus 1.8 petrol.

Are the 2 Lambda sensors pre and post cat actually different parts? On eurocarparts, some are listed as "In front of the catalyst" and others "After catalyst". So I will need one of the in front of catalyst and one of the after catalyst sensors, right?

And will I be alright with these two cheap ones, given that this is probably the last MOT I will get it through?:
http://www.eurocarparts.com/ecp/c/F...2d729923b561e89fdeb162b6e451b132ab3983&000210

and

http://www.eurocarparts.com/ecp/c/F...9bb2b77ea713a85101f62893392d496f9959a9&000210

Thanks!

 

[joesmith]

Thanks for the advise guys - just went with FAE ones in the end as they were the cheapest in stock in my local store. Just needed it to get it through this MOT (not expecting to have the car by next year) and they have done just that, emissions down and all passed

 

[joesmith]

Thanks for the info - good to know!