USA - California - CARB Approves Heavy-Duty OBD Amendments, Adopts REAL NOx & CO2 Tracking

​The California Air Resources Board (CARB) adopted revisions to the Heavy-Duty On-board Diagnostic (HD OBD) regulation. Among the revisions, CARB approved Real Emissions Assessment Logging (REAL) requirements that involve the collection of NOx and CO2 emission data in real driving.
The REAL program would require OBD systems to collect and store NOx emissions data on medium- and heavy-duty diesel vehicles in-use starting in the 2022 model year. It would also require OBD systems to collect and store fuel consumption data that would be used to characterize CO2 emissions on all heavy-duty vehicles in-use. Storage of similar data for greenhouse gas emissions is already required on light-duty and medium-duty vehicles starting in model year 2019. The REAL data will be retrieved from the vehicle by plugging a scan tool or data reader into the vehicle.