California Air Resources Board

On August 1, 2026, CARB received a petition to amend the California Smog Check On-Board Diagnostics II (OBD II) testing regulations. On August 19, 2026, the petitioner agreed to extend the due date for CARB's response to the petition to October 31, 2026. The petition and CARB's response are provided below:

• Petition for Rulemaking (August 2026)
• CARB's response to the Petition for Rulemaking (October 2026)