Well, I sell Toyota cars for a living and have never had a problem with the gas cap not "clicking". But, if it really isn't clicking, then take it back to your dealership which you bought it from and find your salesperson who sold you the car and explain your problem. We salespeople aren't only here to SELL you the car, but to also help you with any problems such as this when pertaining to your new car. If the salesperson can't help you then he/she should direct you to the service dept. where they can help you with your problem. Also, about your engine noise, I am guessing that you purchased a 4 cylinder model of the Camry which is a bit more noisy than the V6 model. I would also have service look at the car to see if MAYBE there is a problem with the excessive noise. Good Luck!
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