The generic scanners only do basic engine functions and none of the rest of the electrical systems. I found it cheaper to just stop at my local auto parts store and 'borrow' theirs. Of course, over the past 7 years, I have only had 3 check engine lights.

If you have a portable PC, your best bet is to get OBD software and a connector cable. Cheap and effective, just clumsy to haul to the car.

A 'good' scanner for $100 or so should also have real time running data on display, like the O2 sensors, etc.

Do not get the el cheapo that just says 'pass/fail'.

Klaus
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Always willing to listen, just not able to take direction.