If you have completed your technical training for automobile maintenace for three years  in Japan and if you can prove your skill level with certificates etc.,  you don’t have to take skill test or Japanese language test before applying for Tokutei gino visa to work for certified car repair factories/garages.    If you want to get test exempt, show 外国人自動車整備技能実習評価試験専門級（gaikokujin jidosha seibi gino jisshu hyoka siken senmonkyu) , Notice letter of the result of skill test, or Evaluation report filled out by your former employer.

If you haven't finished the above mentioned technical training in Japan, you could prove your visa eligibilty by passing the tests.

Please note that this  is not auto manufacturing industry. 

Based on "Operation guidelines" dated March 9, posted on HP of Ministry of Justice