One problem related to engine has been reported for the 2001 Toyota Avalon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota Avalon based on all problems reported for the 2001 Avalon.
Engine oil gelling. My 2001 Avalon xls has 42,000 miles and is in the shop for extensive repairs due to oil gelling. I changed the oil regularly and there is no reason for this to happen absent a defect in the design. I have been a loyal Toyota customer and this is my 4th Toyota car. Dependability is the no. 1 priority for me. To add insult to injury, because I must depend on my vehicle while it was in the shop I decided to trade it in for a 2004 Lexus. Imagine my disgust when the dealer discounted the value of the trade-in because of oil gelling. A lot of people are having this problem.