Ontario's vehicle inspection standards separate mechanical/safety criteria from emissions criteria. Understanding which schedule applies helps clarify what is actually being checked on a given appointment.
Schedule 1 of Ontario's DriveON inspection standards sets out the emissions test procedures for heavy diesel commercial vehicles. A vehicle due for a plate-renewal or ownership-transfer inspection may require emissions testing, a safety inspection, or both, depending on its class, weight and model year.
Schedule 1 covers emissions procedures. Heavy-duty safety inspections use National Safety Code Standard 11B together with Ontario's Directive Schedule 2 procedures and modifications. Schedule 2 is not simply a short list of mechanical checks — it incorporates NSC 11B with Ontario-specific procedures, equipment standards and modifications.
A heavy-duty diesel emissions inspection includes a pre-test check before the opacity procedure. The pre-test confirms the vehicle is in a condition where the official test can proceed under DriveON requirements. Only a registered DriveON technician using approved equipment at an authorized facility may perform the inspection.
Qualifying heavy-duty diesel commercial vehicles receive an opacity test using the SAE J1667 snap-acceleration procedure, referenced under Ontario's emissions rules. A pass means the vehicle is within its regulatory opacity limit at that time — not a full diagnostic of long-term aftertreatment condition.
A heavy-duty diesel emissions inspection includes a pre-test check and opacity test. Eligible 2007-and-newer vehicles with a GVWR of up to 6,350 kg also receive an OBD system test. Newer heavier units may also receive OBD data collection under the current DriveON directive. OBD should not be described as a universal replacement for opacity testing.
Schedule 1 addresses emissions performance and related OBD components where they apply. Safety inspections follow NSC 11B plus Directive Schedule 2. We do not reproduce the full official directive text here; the authoritative source remains ontario.ca DriveON documentation. Related guides: Ontario DriveON program explained and DriveON vs. old MVIS. Book emissions testing through Piotr Service.
