Do I need OBD, smoke opacity or a visual inspection?

Generally, 2013 and newer diesel engines and 2018 and newer alternative-fuel engines use OBD testing. Older diesel engines require smoke opacity plus a visual inspection; older alternative-fuel engines require a visual inspection rather than a smoke test. Special engine configurations need individual review.

Choose OBD testing or opacity testing after confirming your engine details. Tell us about an engine replacement before booking.

Official source: CARB test-method requirements.