Who usually needs it
Heavy-duty diesel with OBD (commonly 2013+ engine model years) subject to Clean Truck Check periodic testing.
San Diego County service page
Mobile HD-OBD Clean Truck Check
On-board diagnostics testing for supported 2013+ diesel trucks (and qualifying alternative-fuel vehicles). We bring a CARB-certified OBD test path to your yard — no shop trip.
What HD-OBD covers
This site is San Diego County only (NAP). Pricing: OBD $119 · OVI $219. Northern California → norcalcarbmobile.com.
What we do on site
Connect with approved OBD equipment, pull the required data path, and document the result for your compliance file.
How to prep
Have VIN, plate, odometer/hours, and a safe place to park. Trucks should be accessible when the tech arrives.