One problem related to power train driveline has been reported for the 2007 Toyota Avalon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Toyota Avalon based on all problems reported for the 2007 Avalon.
Bolts securing driveshaft sheared off, with bolt pieces shooting into the engine and into the engine cover. It caused the engine to fail by bending the piston parts.