Gone are the days when you could fix every car with a wrench and a multimeter....

https://wiki-triod.win/index.php/Why_Does_My_Check_Engine_Light_Keep_Coming_Back%3F_Stop_Clearing_Codes_and_Start_Fixing_Cars

Gone are the days when you could fix every car with a wrench and a multimeter. Modern vehicles rely on a network of ECUs that control everything from your engine timing to door locks