The seal at the dealer will run you between $14 to $27. (because they generally charge you twice what it costs them (online 13.75))
Then you have the labor that starts some where around $55.
You can find a small vacuum leak in your 2002 Toyota Camry with a diagnostic tester. The diagnostic tester can pinpoint virtually any vacuum leak.
could be timing It can be many things. I would suspect you have a vacuum leak.
There is not enough information to answer this question
The Camry could have a vacuum leak. If there is a vacuum leak, then there can be a whistling sound until the vacuum system is full of air.
Oil can either be burned, or it can leak
Yes it is, you have to get it looked at ASAP.
To answer your question; I would say your Freon is low and you need a recharge but it also tells me you have a leak somewhere.
You need to replace the oil seal.
$4 to $5 for Toyota o-ring. Don't use after-market. 1 hour labor. Go to dealership because they will warranty it for 12 months. It may leak again after 6 - 10 months. If u buy the Toyota part and give to your mechanic, u will get no warranty.
Contact the dealership. It might cost you a pretty penny though.
You do not have many choices either replace it or if the leak is not sufficient buy one of those leak fix bottles.
That isn't much consumption.. If it buggs you take it to a garage and have them give you an estimate.