ARB test programs introduction page

Locating vehicle "Test Group" and "Engine Family Numbers"

This page last reviewed January 6, 2012

All vehicles sold in the United States have a unique drive-train identifier called the "Test Group" or "Engine Family Number". This number allows owners, parts suppliers, and service providers to determine specifications and installed emissions control equipment of motor vehicles. Because many vehicles may have several different configurations, this number will provide specific information about the emissions control system and exact standards that a vehicle was designed to meet.

The Vehicle Emission Control Information label is located in the engine compartment in a clearly visible position, most often directly on the underside of the hood. The following diagram can help you locate your vehicles label.

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