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This $20 device told me exactly what was wrong with my car

A p0440 error code can mean several different things, ranging from a loose gas tank cap to a major emissions leak, a bad ...

Using An OBD-II Scanner: What It Can And Can't Tell You

An OBD-II scan tool is an incredibly useful automotive diagnostic device, but it's not magic. Here's what it can and can't do.
CNET

Lemur BlueDriver OBD-II scan tool review: BlueDriver diagnoses engine problems, shows smog check readiness

OBD-II diagnostic device BlueDriver interprets engine error codes to suggest what might need fixing, and lets you know if your car is ready for a smog check. Wayne ...