JordanCoupe wrote:Post up what readings your getting; High/low rpm, c02 lambda etc. it could be a million things but its a lot easier to narrow down when ya have the readings.
Also where are your two cats located? They don't work at all unless they get vey hot so the second one may not be getting upto temp and could actually hurt your emissions
davehayes wrote:Would it be worth taking it to a tuner get it set up see if it's running too rich or something like that, I had same problem but passed in the end,heat wrapped the cat but that was my next plan!
altezza kc wrote:post up what readings you got
E910 wrote:I assume you have an auto with 2 cats & 2 O2 sensors? Is your aftermarket set up an exact copy of the factory front pipe? I'd get the work double checked. The O2 sensors may not be wired up properly although that should bring up the engine check light.
I assume you've cleaned the MAF & throttle body as well?
What oil are you using? A low ash C3 rated oil may help reduce you emissions (Motul 8100 X-Clean 5W-30 C3 is one that springs to mind). Iridium plus will help as well. As other have said always get the exhaust nice & hot before getting it tested.
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