How Today’s Emissions Testing Catches Problems Early

Every modern heavy-duty truck has a built-in computer that monitors the engine every second you drive. This system is called On-Board Diagnostics, and it is the main tool used during a test. When you visit a station for emissions testing near you, the technician plugs into this computer to see what it has recorded. The computer tracks things like how much fuel is being used and if the air sensors are working correctly.

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