Would High Flow Cat cause any codes that can fail the emission testing via OBD II?
SYK Well-Known Member Joined Jul 12, 2015 Threads 24 Messages 242 Reaction score 34 Location Atlanta Vehicle(s) 2015 EB Premium PP Auto Jan 17, 2017 Thread starter #1 Would High Flow Cat cause any codes that can fail the emission testing via OBD II? Sponsored
JungleG1337 Well-Known Member Joined Apr 25, 2015 Threads 89 Messages 830 Reaction score 77 Location MD Vehicle(s) 2015 Ecoboost Jan 17, 2017 #2 It will throw a code. You need an L extension for your O2 sensor.
