Abstract Reuse parts are parts removed from scrap automobiles that can be still used. In general, reuse parts reduce not only the cost for replacement of failed parts but also the environmental load. This study quantitatively evaluates environmental loads, such as the amount of CO2 emission during the production of brand new parts, in order to quantify the beneficial effect of the reuse parts. The amount of CO2 emission can be calculated from the power consumption and operating time of each tool and machine employed. Reuse parts generate 0.62 kg of CO2 per automobile when produced, which corresponds to 1,212 kg per year. However, the amount of CO2 emitted from scrapping automobiles without producing new replacement parts is 3,063 kg per year. Therefore, the production of replacement parts emits three times less CO2 than scrapping
