Emissions light staying on

[jibm]

Afternoon all

My emissions light has been coming on for the past few weeks and is now staying on all the time, so i have to put it into the stealers next week for a diagnostic check.

I have done a quick search on here but that shows up all sorts of issues from new vanos to coils

As far as i am aware its the lambda/oxygen sensors or the cats perhaps?

I would be grateful for some input from anyone who knows what else it could be, before i get arse raped by BM.

Also does anyone know of a good specialist surrey way that might be able to help?

many thanks