Question re: catted dp, CEL, and Bootmod3
I am considering upgrading to a high-flow catted downpipe. However, we all know that even a catted downpipe will throw a code and cause the Check Engine Light to come on.
I understand that Bootmod3 can be programmed to eliminate the CEL. My question is: how exactly does it eliminate the CEL? Does the Bootmod3 programming allow for accurate reading of the exhaust through the O2 sensor but change the parameters within the DME as to what are acceptable readings in the exhaust? Or does it "trick" the DME into reading cleaner exhaust gasses? Or does it allow the O2 sensor to read accurately but it just overrides the DME's attempt to go into "limp" mode? or is it none of these?
Forgive my ignorance if none of these are legitimate possibilities.
I'd appreciate some clarification on how the CEL is eliminated. Thanks!
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2016 328i XDrive N26 8AT: K&N Drop-In Filter * GPlus FMIC * ER Chargepipe * DinanTronics Sport Tuner (Race +4psi) * AWE Midpipe (2nd Cat Delete) * Dinan Axleback Exhaust * Dinan Sport Springs * Megan Racing Front Strut Tower Bar * Cross-Drilled Rotors * Hawk HPS 5.0 Brake Pads * StopTech SS Brake Lines
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