What is the 550 rule referring to in vehicle inspections?

The 550 rule in vehicle inspections specifically pertains to a guideline that suggests the mileage or age for catalytic converter replacement. This rule stems from the need to maintain emissions control systems effectively to ensure that vehicles meet environmental standards. As vehicles age or accumulate a certain amount of mileage, the efficiency of the catalytic converter may decline, potentially leading to increased emissions and failing inspections.

By adhering to this guideline, inspectors can ensure that the catalytic converters in vehicles are adequately checked and replaced as needed, contributing to cleaner air and effective vehicle operation. This focus on catalytic converters aligns with broader environmental initiatives aimed at reducing pollutants emitted by vehicles on the road.