In-Use Motor Vehicle Recall and Correction Regulation Article 9

For the test vehicles mentioned in Article 7 or 8, if two or more vehicles were unable to perform the investigation emissions test due to functionality defect or being installed with a defeat emissions control device, or when the test results are unable to correctly indicate the emissions values of that vehicle, then the investigation test of that engine family or vehicle model shall be deemed as fail to comply with the emission standards.
中文原文 使用中汽車召回改正辦法第9條
前二條之受測汽車,有二輛以上因同一污染排放控制元件功能失效或有減效裝置者,導致該受測汽車無法進行污染排放測試或測試結果無法正確顯示該車排放污染值,則判定該引擎族或車型之調查測試不符合排放標準。

English translation for reference only; the Chinese text prevails. Not legal advice.