The Toyota Sienna was first introduced in 1998. It replaced the outgoing Toyota Previa, which was discontinued in 1997. It gets its name from the Italian city, Sienna, located in Tuscany. Like many other vehicles, this minivan has undergone plenty of improvements throughout its time. It is a comfortable and spacious car that can seat up to 8 passengers. In today’s post, we’ll highlight the Toyota Sienna years to avoid, which we base on the number of problems filed.