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tholyoak · 04-08-2007, 01:42 PM

It sounds as though you are running no cats, replacing both the front cats with headers and the rears with the test pipes. If this is the case you will have issues. The DME needs to see a drop between the front and rear O2 sensors to know the cats are working, if it does not, CEL.

Todd

04-08-2007, 01:42 PM	#3
tholyoak Registered User Join Date: Jan 2006 Location: Glen Allen, ON Posts: 314	It sounds as though you are running no cats, replacing both the front cats with headers and the rears with the test pipes. If this is the case you will have issues. The DME needs to see a drop between the front and rear O2 sensors to know the cats are working, if it does not, CEL. Todd __________________ Current Cars: 1989 911 Targa 1984 944 Original Owner 1971 911T