One problem related to crankcase (pcv) 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.
Total loss of oil from crankcase. Burst oil line on my 2007 Toyota Avalon resulting in the pumping of oil onto the ground with no warning lights. This has been a documented problem for several years, as found on several consumer websites. The fix cost me >$450 not including towing to Toyota dealer.