Since 2015, A.G. Automotive & Diagnosis has provided Reseda area customers with easy to understand estimates before beginning any work. Ask us about options to keep auto repair costs low or upgrades to keep your car running at peak performance. We stand behind all of our work with a guarantee you can take to the bank. Since 2015, A.G. Automotive & Diagnosis has provided Reseda area customers with easy to understand estimates before beginning any work. Ask us about options to keep auto repair costs low or upgrades to keep your car running at peak performance. We stand behind all of our work with a guarantee you can take to the bank.