Unlimited Smog Check in Santee runs a test-only station on Prospect Avenue equipped for both OBD-II port inspections on post-1999 vehicles and dynamometer-loaded tailpipe tests on older models requiring ASM or two-speed idle protocols. The station handles motorcycles registered between model years 1976 and 2012 that fall under California's two-wheel emissions mandate, a certification niche shared with powersports operations on Mission Gorge Road including Full Throttle Power Sports. Diesel-specific testing covers opacity measurement and snap-acceleration protocols for commercial and heavy-duty truck applications, alongside standard gasoline and hybrid inspections. Initial California certification for out-of-state vehicles requires the full BAR protocol rather than an abbreviated biennial renewal, and drivers completing that registration process frequently address fluid baselines at East County Lube Center on Mission Gorge Road in the same service cycle. The ASM dynamometer loads the vehicle at 15 mph and 25 mph while a five-gas analyzer measures hydrocarbon, carbon monoxide, carbon dioxide, oxygen, and oxides of nitrogen concentrations at the tailpipe.