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Try uninstalling MHD entirely then reinstalling. My car has been slowly developing this about once per year since I've owned it and this keeps it away for about a year.
Some say that inlets seem to cause this due to the scaling in the tune and others say it's the catalyst monitoring that gets more sensitive with tuning--if it's the latter, supposedly there's a software update that will eliminate it.
I've always had other bigger issues arise that need my attention more so haven't gotten around to figuring this one out yet, but it's common LOL.
What tune and mods are you running?
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