151 Engine Service and Repair Technician Handbook Engine Serial Number Engine serial numbers provide valuable information about where and when that particular engine was manufactured. Currently, the automotive industry, including Toyota, relay on parts sourced from multiple manufacturers and suppliers. If a quality issue arises and the manufacturer needs to evaluate the range of products affected. The serial number is used to determine the plant where it was manufactured and when it was made in the series of production. Typically, when a TAS case or product report is opened, the part serial number will be required to process that report.
It is important to have this information ready when contacting TAS. 20 Technical Training