My son's 2000 or so Saab will crank over but not fire. He drove it to the store and when he came out it would not start. If I tow him over to autozone can they plug in and see what is wrong with it?

It has a loud exhaust and I don't know if it still has its cat or not.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.