Where is the second or additional emission control label typically affixed on some diesel-powered vehicles?

• A. Engine
• B. Under the hood
• C. Exterior bumper
• D. Inside glove box

Answer: (A)

The main idea is that this label needs to stay with the part of the vehicle it documents—the emission control system tied to the engine. On some diesel-powered vehicles, the second emission control label is placed on the engine so it travels with and can be viewed alongside the engine and its aftertreatment components. This makes it easy for technicians to verify exactly which controls are present and in use during inspections or service. If the label were tucked under the hood, attached to the bumper, or kept inside a glove box, it would be more likely to be obscured, damaged, or separated from the system it describes, making quick verification harder. The engine is the most reliable, obvious place to keep that information for ongoing reference.