04 Corolla LE good car?

My wife is looking at a 04 Corolla LE with less then 30,000 mile on it but it has the engine light staying on. Seller says it's probably a gas cap issue but I'm not familiar with Toyota's and the problems they may have. Seller has all the service records on the vehicle. My wife has been driving a 2000 Mazda Protege that has been just a great car but wants something a little softer ride and a few years newer.

Thank you!

MN Walleye