Which automotive safety component was responsible for the largest vehicle recall in history, affecting over 100 million vehicles globally from multiple manufacturers?

The automotive industry has seen numerous product recalls over the years, some with staggering numbers affecting millions of vehicles worldwide. These recalls highlight the critical importance of safety standards and quality control in transportation manufacturing. This trivia question focuses on one of the most significant product safety issues that affected the global automotive industry and led to substantial changes in safety regulations and practices.

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Takata airbag inflators
Toyota accelerator pedals
Firestone tires
GM ignition switches