I own a 2003 Touring Edition 5 speed. The only early on problems that you may encounter are spark plugs and wires. You may want those replaced as soon as your buy your PT.
Just look, feel, and listen for the usual things you would on any other used car. Does the engine sound right? When you drive it, is there any vibration in the pedals, steering wheel, or stick? A little vibration is OK, but not a lot. Does everything look to be in good functioning order? The 2.4L DOHC is a good reliable engine. Be careful, you will get sucked into the world of customization.
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