Which automotive safety component was subject to the largest and most expensive product recall in transportation history, affecting over 100 million vehicles globally?

The automotive industry has experienced numerous product recalls over the years, but one stands out as the largest and most expensive in transportation history. This massive recall affected multiple manufacturers across continents, led to the bankruptcy of a major parts supplier, and continues to impact vehicle owners today. Test your knowledge about this significant transportation safety crisis that reshaped how the industry approaches component sourcing and quality control.

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Takata airbags with defective inflators that could explode and propel metal fragments
Toyota accelerator pedals with unintended acceleration issues
General Motors ignition switches that could shut off engines while driving
Firestone tires prone to tread separation, primarily affecting Ford Explorers