(a) Replacement parts. The executive officer may order, for cause, the manufacturer of any replacement part subject to the provisions of this article to submit any records relating to such part which are maintained pursuant to section 2221(b) above. The executive officer may order, for cause, the manufacturer of any replacement part subject to the provisions of this article to submit a reasonable number of parts typical of the manufacturer's production for testing and evaluation. If, after a review of all records submitted by the manufacturer and of the results of any tests conducted by the state board's staff, the executive officer finds that such part is not in fact a replacement part, the executive officer may invoke section 2225. Replacement parts evaluated pursuant to this section shall be compared with the specifications contained in the applicable vehicle manufacturer's application for certification.

(b) Add-on parts and modified parts. The executive officer may order, for cause, the manufacturer of any add-on part or modified part subject to the provisions of this article to submit a reasonable number of parts typical of the manufacturer's production for testing and evaluation. In-use performance will also be evaluated. This will include Inspection and Maintenance requirements and compliance with onboard diagnostic system regulations. The executive officer may invoke section 2225 if, after a review of the results of any tests or evaluations conducted by the state board's staff and of any information submitted by the manufacturer, the executive officer finds that an add-on part or a modified part does not conform to the “Procedures for Exemption of Add-on and Modified Parts,” adopted by the state board on November 4, 1977, as amended June 1, 1990, for exemption applications submitted before January 1, 2022, or the “Procedures for Exemption of Add-On and Modified Part(s) for On-Road Vehicles/Engines,” adopted by the state board on June 29, 2021, as amended March 23, 2023, hereby incorporated by reference, for exemption applications received on or after January 1, 2022.