Which source would provide information about aftermarket parts labeling used for emission control components?

• A. Emission component location guides
• B. CARB aftermarket parts listings
• C. Aftermarket parts labels
• D. Any reliable vehicle manufacturer sources

Answer: (C)

The labels on aftermarket parts themselves are the primary source of information about how those parts are labeled for emission control use. Those labels carry the compliance details you need to recognize and verify, such as the CARB EO number and other emissions-related markings that show the part is approved for installation. This direct labeling information is what technicians rely on during inspection and verification.

Other sources don’t provide this exact labeling detail. Emission component location guides tell you where components are, not how they should be labeled. CARB aftermarket parts listings can indicate which parts are approved, but they don’t show the specific labels that appear on the parts. Manufacturer sources offer general product information, which may not reflect the labeling used on aftermarket emission control components.