I'm okay with a black box if I can plug into it and get answers without paying exorbitantly or worse yet being gate-kept (JOHN DEERE)... a lot of cars have a socket under the driver's dash you can plug into and ask it WTF it's flashing CHECK ENGINE and you can replace the proper gee-gaw without guesswork... the thingy to plug into it runs from $32-100 (the latter are freakin' BLUETOOTH, which, NO, I'm not just leaving it plugged in!) which... is less than a major service by a good bit...

Some people think they can keep us slave to the Man that way. They'd be R-O-N-G.