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Duty Trucks, and Medium-Duty Vehicles and

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DISCUSSION: The on-board diagnostics II (OBD II) regulation requires all vehicle manufacturers to monitor virtually every emission-control component and system that can cause increases in emissions. When an emission-related malfunction is detected, the OBD II system alerts the vehicle owner by illuminating the malfunction indicator light (MIL) on the vehicle instrument panel. By alerting the owner of malfunctions as they occur, repairs can be sought promptly, which results in fewer emissions from the vehicle. Manufacturers began phase-in of the OBD II requirements in 1994, with full implementation required on all 1996 and newer model year vehicles. The Air Resources Board (ARB) last adopted modifications to the curren

Year: 2012
OAI identifier: oai:CiteSeerX.psu:10.1.1.226.2653
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