Master Tech Auto Service is a locally owned automotive service and repair shop, servicing the Norman area since 1991. Our team of highly trained professionals are equipped to handle all your automotive needs with the most up-to-date scanning and diagnostic equipment available. Master Tech Auto Service is a locally owned automotive service and repair shop, servicing the Norman area since 1991. Our team of highly trained professionals are equipped to handle all your automotive needs with the most up-to-date scanning and diagnostic equipment available.