California Air Resources Board

Fact sheets for the Heavy-Duty Inspection and Maintenance Program (HD I/M):

• HD I/M Regulation: Vehicle Owner Basics
• HD I/M Program Background and Regulation Basics
• Periodic HD I/M Testing Requirements
• HD I/M Tester Training and Examination
• On-Board Diagnostics (OBD) Testing Devices

Information booklets for the Periodic Smoke Inspection Program:

• PSIP Booklet September 2020 
• PSIP Booklet November 2020 (Spanish)