What action must be taken if a vehicle is found with tampered emissions controls?

When a vehicle is found with tampered emissions controls, it must fail the Smog Check. Tampering with emissions control systems compromises the vehicle's ability to meet environmental standards set by the California Air Resources Board. These systems are designed to reduce the pollutants emitted into the atmosphere, and any modification or removal can lead to increased emissions. As such, failing the Smog Check ensures that only vehicles that comply with emissions requirements are allowed on the road, promoting better air quality and adherence to regulations designed to protect the environment and public health.