The computer (ECU actually) is used to program the powertrain and store problems. Your dashboard screen can be scrolled to display stored codes too.
Basic tests and inspections are your best bet to see what the general condition is and if something shows up the "computer" may be required to pinpoint the problem.
I like to explain it this way to my customer-"the computer (ECU) isn't going to tell you you got a flat tire. You still have to do a walk around inspection before taking off".
I know if you have TPMS that will notify you but you see my point??
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