Not gonna help much, except maybe with the degree of concern...
Just remember that the 'Check Engine' Light
might mean
something sometimes; but it's also the default 'catch all' warning light that the computer will illuminate instead of saying '
What The F...!!' or '
Fudged If I Know?!' :dontknow: . :gaah:
So when there's no active code associated with that particular light, basically it's saying that even the on-board computers have no idea what the problem is - which could mean that it's either too trivial a problem to stress over all that much :dontknow: or it's such a complex cascade of compounding issues that the computer just has no bloody idea of what code to choose/put up and instead, it's gone into 'auto-gibber' as a result!! :gaah:
Has anyone looked at/checked the O2 sensor/s &/or their wiring leads & plugs??