how to diagnose problem with exhaust emissions?

hi i hve e class benz (CO) is to much high all emissions is fail dnt knw what to do
mechanics and mot people told me change cat which cost nearly £450 plz if some one knows replay back.

jan
May 2013

how do i change a rear lamber sensor on rover 45

mark hawes
June 2010

I am also facing the same problem. The exhaust emission light is always on. However, on driving above 50 mph, the light starts blinking. It stops blinking, the moment I come down to below 50 mph.

Did you use Cataclean ? What were the effects ?

Another Frustrated
January 2009

often rear lambda sensor wire breaks free from clip,and rubs on drive shaft.worth a look

mutley
December 2008

You need to have a diagnostic done. You don't have to use a Vauxhall dealer. A decent none Vauxhall garage should charge around £25 for a diagnostic. Phone & ask for a price first.
Other choice buy a OBD 2/canbus reader off fleabay for under £50 & diagnose prob yourself. Basically plug reader in to diagnostic port & it will come up with an error code. You can reuse these readers on most cars, so a good diy tool. I bought one a couple of years ago & cost me around £30 & came with fault code book. I have used reader 3 times successfully on different makes of cars.
I have an 2000 Astra G, OBD port (looks like a scart socket), under handbrake lever inside car. May be the same for your Zafira, but not sure.
Otherwise it's guess work.

George.
December 2008