Yes i monitor all the data via app on my phone. Back in Feb, I was on motorway when CEL came up & she went crazy on fuel.
Pulled out the code, it was about 'mixture too lean' i think. Checked all the related sensors i.e. MAF, O2, they were fine.
Then observed fuel trim readings especially LTFT, whose % was higher than normal range & it came out to be a vacuum leak from bad injector seals.
Damn, that tiny issue took me 3 days to diagnose. But yes, OBD2 is blessing & I miss it in my 7afe setup.