Camry Q&A: Does it have a timing belt or chain?
Does the 4-cylinder engine have a timing belt or chain?
From Seattle Chew on Yahoo! Answers
AutoTrader: In the 2012 Toyota Camry, both the 2.5-liter inline 4-cylinder and 3.5-liter V6 engines use a timing chain and not a belt. This is important because a rubber timing belt typically needs to be replaced every 75,000 to 90,000 miles, generally resulting in an expensive bill from your mechanic. A timing chain can last much longer.