I have tried plenty of inexpensive obd2 scanners, and found they are all over the place as far as features and quality. The only one I have now is the BAFX products ELM327. From using this little 20 dollar gizmo on many dozens of cars of many makes and models, I can tell you it will access anything the car will let you access without having a factory authorized (bosch, snap-on, etc.) controller attached. It is a very versatile and robust device for its low cost.
BAFX also makes a usb version if bluetooth is not for you.
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