Which is not a source to determine a vehicle's emission control requirements?

• A. The vacuum hose routing diagram is not a source for determining emission control requirements.
• B. The vehicle information database is a source.
• C. The vehicle look-up tables are a source.
• D. The emission label is a source.

Answer: (B)

Emission control requirements come from official, vehicle-specific references rather than broad data beyond the regulatory scope. The emission label on the vehicle provides the exact components that must be present and functioning, and manufacturer or regulatory look-up tables tell you, for a given model year and engine, which controls are required. A vehicle information database, by contrast, isn’t the authoritative source used to determine those requirements in the field; it doesn’t provide the precise, model-year–specific emission configuration you must verify. In practice, you rely on the label and the look-up tables to confirm what emission control devices are required and how they should be configured.