California Air Resources Board

Yanmar Power Technology Co., Ltd. Settles For $2,429,900

In March 2026, the California Air Resources Board (CARB) reached a settlement with Yanmar Power Technology Co., Ltd. (Yanmar), with its principal location in Osaka, Japan, in the amount of $2,429,900 for the company's violation of CARB’s Off-Road Compression-Ignition Engines and Equipment Regulation (Off-Road CI Regulation), under California Code of Regulations, title 13, sections 2420-2427, and the Off-Road Large Spark-Ignition Engine Regulation (LSI Regulation), under California Code of Regulations, title 13, sections 2430-2439.

This case resulted from Yanmar voluntarily self-disclosing to CARB that it had not used correct test data and that it did not report test data for a significant number of its model years 2013 through 2025 off-road compression-ignition (OFCI) and large spark-ignition (LSI) engines sold in California. These are violations of CARB’s emission certification requirements pursuant to Title 40, Code of Federal Regulations, sections 1039.205(r)(1) and 1048.255(c)(2), as incorporated in California Code of Regulations, title 13, sections 2423 and 2433, respectively. All OFCI and LSI engine manufacturers must submit complete and accurate certification applications to CARB with all required emission test data in order to legally sell their engines in California. Fortunately, all of the subject violations were determined to be minor with no significant emissions impacts affecting the engines that were issued certifications.

The full civil penalty amount will be deposited into CARB’s Air Pollution Control Fund, which provides funding for projects and research to improve California’s air quality. In addition to payment of the civil penalty, Yanmar fully cooperated with CARB staff to correct the deficient certification applications, and implemented significant preventative measures within its internal operations designed to minimize similar violations from happening in the future.

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