What causes the rotten egg smell in a Lexus430 when accelerating?

The rotten egg smell in a Lexus430 when accelerating is typically caused by a faulty catalytic converter. The catalytic converter is a component of the exhaust system that helps to reduce emissions by converting harmful pollutants into less harmful substances. When the catalytic converter is not working properly, it can cause the rotten egg smell due to the release of hydrogen sulfide gas. This gas is known for its distinctive, unpleasant odor that resembles rotten eggs. It's important to have your vehicle inspected and the catalytic converter replaced if necessary to eliminate the smell and ensure proper emissions control.