Someone help...cel light with header.

[abarab]

So i installed my DCRH about 2 or 3 weeks ago and no problem, not a single light came on. But, two days ago, i was cruising on the highway and all the sudden it came on. I have the two spark plug non-foulers on the secondary sensor with the 1/4 inch whole drilled. My friend has a 06 type s and his only came on once, and when he resent it, it never came on again. And it's been almost a year since he installed the header. So plugged in the obd II scanner and I can't remember if it showed the code P0240 or P0420 (it's one of the two). I believe the description says "Control Efficiency below threshold (bank 1). Can anyone explain why it's still showing the cel?

Thanks

[mrbill]

Originally Posted by abarab

So i installed my DCRH about 2 or 3 weeks ago and no problem, not a single light came on. But, two days ago, i was cruising on the highway and all the sudden it came on. I have the two spark plug non-foulers on the secondary sensor with the 1/4 inch whole drilled. My friend has a 06 type s and his only came on once, and when he resent it, it never came on again. And it's been almost a year since he installed the header. So plugged in the obd II scanner and I can't remember if it showed the code P0240 or P0420 (it's one of the two). I believe the description says "Control Efficiency below threshold (bank 1). Can anyone explain why it's still showing the cel?

Thanks

"P0420 Catalyst system efficiency below threshold"

Just a SWAG. After you removed the catalyst, well....

-mr. bill