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1

Omega General Help / Re: p0420

« on: 04 June 2008, 22:10:14 »

i understand how that would work on that system!!but dont think it would work on mine!!my after market cat only has one cat and o2 sensor before and after.i noticed that the old one has two cats!i brought this up with the suplier and they said thats the only exhaust listed for my car!!could it be the missing pre cat thats causing my problem with this fault code!! :-/ if i bought a vauxhall cat will it have a pre cat on it and what would be the cost,not cheap i'll bet? and will this sort my problem ive also had the emmissions checked and they passed all tests!!ohhh why is this light on ohh why once again thank  you for any help on this matter!!!!

2

Omega General Help / p0420

« on: 04 June 2008, 20:42:13 »

can anyone help?? i've got a 2000 2.2 automatic omega with the fault code p0420 cat efficiency low bank 1.  I replaced the standard cat with an after market one and had both o2 sensors replaced but yet the eml keeps coming on and reading the same fault code.  I even tried taking back the after market cat and getting it replaced under warrenty thinking it might be a faulty unit but still the light comes back on after resetting.  has anyone had a similar problem and should I be looking for something else i.e. vaccum leeks or airflow sensor fault etc.  Any help would be greatly appreciated, thanks!!