One problem related to catalytic convertor has been reported for the 2006 Toyota Avalon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota Avalon based on all problems reported for the 2006 Avalon.
When stepping on the gas for a quick acceleration, there is almost a gagging sulfur smell inside the car. This happens when entering the freeway via an on-ramp or just passing another car.