emissions problem! help

[fat_charlie]

hey,
just stuck my ek9 for a mot and it failed 4 emissions. i was away to get a new lamda censor but dont know if this is the fault!(and are very expensive) is there any common problem with emissions?? the readings during the emission test were jumping up and down, the lamda reading was fine but the c02 was crazy, then the lamda readin was crazy and c02 fine and it just kept changing. Can anyone help??
cheers

 

[Vtec6000]

Have you a standard cat in place or a decat?

 

[Wedgie]

As said before, more info is required on what mods you have (if any)....

 

[fat_charlie]

well it has the original exhaust ( with cat)with a integra manifold. it has got a c's supercharger aswell. are the ek9 and integra have the same lamda censor?? anyone know?