Joined Oct 2015
545 Posts | 0+
Minnesota
So far, the only thing I've read that will throw a code is disabling 02 sensors without a tuner/flash.
I think he was wondering if an aftermarket filter would cause an over-lean scenario.
Personally I wouldn't worry unless you have both a filter and slip-on. Some people seem to think that a slip-on helps with the surging issues. I'm doing more research on the topic, as I have a sprint filter I want to install before I go on a road trip in April.