What type of vehicle modifications could lead to a failed inspection?

Modifications that affect safety or emissions are critical factors that can lead to a failed vehicle inspection. Safety-related modifications could include changes that impact the vehicle's braking system, steering mechanism, suspension, or lighting systems. For example, if a vehicle is modified to have reduced braking efficiency or improper lighting, it could pose a danger to the driver and others on the road.

Emissions modifications are equally important, as vehicles must comply with environmental regulations designed to minimize harmful pollutants. Alterations that increase emissions, such as removing or altering catalytic converters or exhaust systems, would fail an inspection focused on environmental compliance. Both safety and emissions standards are pivotal to ensuring that vehicles operate not only efficiently but also responsibly, adhering to state laws and regulations.

The other options, while they may involve vehicle customization or improvement, typically do not affect the vehicle's safety or emissions in a way that would result in a failed inspection. Therefore, modifications that compromise these critical areas of a vehicle's operation are the primary concern during inspections.