Here is the NISSAN ECU IDENTIFICATION CHART, this should answer your question. http://jimwolftechnology.com/wolfpdf/ECU-ID.PDFif you cant open it, down load adobe reader herehttp://www.adobe.com/products/....htmljmancini wrote:Does anyone know how to tell what year an ECU is - like using serial codes or other ID mark on it? I need to verify that the used ECU I have is correct for the year.