where can I find the chassis computer on 1993 Volkswagen Jetta

one shop return my car not running the other one could not get it running said it needed the computer

Asked by for the 1993 Volkswagen Jetta
If its the 2.0 L gasoline engine, open the hood at the back of the engine compartment just under the windscreen toward the center of the w/screen is where the Electronic Control Module is. There are several service bulletins regarding the ECM. If you take the computer out contact Fuel Injection Corporation in Livermore CA I have found them to be very good at repairing PCM's, you will find them on the internet.