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inTgr8r · 09-29-2015, 05:59 PM

That's good

I ran without rear O2 for several months with no issues.

I now have them connected with the EGT still in the OE position on the headers.
I have no CEL with no tune on the car.

My understanding is that you need the primary O2 for the engine to run properly, but the secondary rear O2 are just to monitor emissions.

09-29-2015, 05:59 PM	#24
inTgr8r Lieutenant General 2434 Rep 11,668 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	That's good I ran without rear O2 for several months with no issues. I now have them connected with the EGT still in the OE position on the headers. I have no CEL with no tune on the car. My understanding is that you need the primary O2 for the engine to run properly, but the secondary rear O2 are just to monitor emissions. __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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