Mobile Clean Truck Check testers

2,543 of 2,867 listed testing businesses in California (89%) say they offer mobile testing: the tester comes to your yard, plugs into the truck's OBD port (or runs a smoke opacity test) and submits the result to CARB. Mobile testing saves drive time for fleets; expect a trip fee for a single truck and lower per-truck prices for several.

Want a tester at your yard? Send one request and up to 3 mobile testers near you reply with a price.

Comparing mobile testers with telematics devices or "test from your phone" services? See remote and telematics testing: what CARB allows and what to ask before you pay.

Mobile testers by county

Mobile testing businesses with several credentialed testers

These businesses have more than one credentialed tester on CARB's list, which usually means more capacity for fleets.

On city pages

Every city page has a Mobile filter. Popular: Bakersfield, Fresno, Los Angeles, Sacramento, Stockton, Fontana, Riverside, San Diego, San Jose, Ontario, San Bernardino, Long Beach.

Source: CARB's public Clean Truck Check tester list, last checked . Listing on CARB's list is optional for testers, so some credentialed testers are not shown. Services, hours and prices change; please confirm with the tester before you go. Something wrong? Send a correction.