How they attempt to bypass the cel, why success is varied, and the legal and technical consequences. Others have modified their exhaust with. Get the facts on o2 sensor spacers
10PCS O2 Oxygen Sensor Spacer Test Pipe Extension Extender Adapter CEL
We detail the technical function, practical limits, and hidden legal risks of this common cel fix.
Regardless, if you are getting a custom tune then you have your ecu unlocked, so you have no reason to keep the spacers installed
Just remove them and turn off the cel in the flash Which is a better option to get rid of the cel with the high flow catted down pipes, big daddy mini cats or cts o2 spacer Just a small spacer (not the mini cat) has worked for me on. A failing catalytic converter or a lazy o2 sensor can keep that light on indefinitely, and it’s annoying—especially when the car still seems to drive fine
