California Air Resources Board

Implementation Guidance

• June 2023 Guidance to Vehicle Owners on Upcoming Requirements
• Guidance to Vehicle Owners on 2024 Periodic Testing Requirements for Vehicles Subject to Semiannual Testing (Issued August 23, 2023)
• Guidance to Vehicle Owners on 2024 Periodic Testing Requirements for Vehicles Subject to Annual Testing: California Registered Motorhomes and Agricultural Vehicles (Issued August 23, 2023)

Fact Sheets

• Vehicle Owner Basics | Español | ਪੰਜਾਬੀ
• Background and Regulation Basics | Español | ਪੰਜਾਬੀ
• Periodic Testing Requirements | Español | ਪੰਜਾਬੀ
• Tester Training and Examination | Español | ਪੰਜਾਬੀ
• On-Board Diagnostics (OBD) Testing Devices | Español | ਪੰਜਾਬੀ
• Database Reporting Requirements
• Handout | Español 

Frequently Asked Questions (FAQs)

Find answers to our most popular questions. If you don't find the answer to your question, please contact hdim@arb.ca.gov.

• Clean Truck Check / Heavy-Duty Inspection and Maintenance Program
• Credentialed Tester 
• Overlap between the Clean Truck Check and the Periodic Smoke Inspection Program (PSIP)
• OBD Test Devices