mk4 de cat problem

[Marcrimie]

Hi i have had my de cat fitted about a week and now all of a sudden the engine management light has turned on and will not go off was i right to leave the second lambda sensor in free air??
thanks
marc

 

[Martyn]

Errr! I'd refit the second lambda probe as it should be fitted post cat. You're EML has come on because it thinks your cat is duff. Decat's are a bad idea on 1.8Ts, you're much better off with a 100 or 200 cell race cat.

 

[Engram]

Why are they a bad idea?

 

[Martyn]

Because you'll get a faultcode and a check engine light and you'll have the faff of having to changing your downpipe and cat over at MOT time.

 

[Marcrimie]

Ok nice one i will re-fit cat and then later buy race cat
cheers
marc

 

[willis2008]

im thinking of getting a de cat where you get yours from mate? i work in a garage with diagnostic equipment so ent hard for me to turn the light off. if you could let me no would b good cheers