Hello everyone, I am looking to purchase the "EOBD Facile Software" so that I can diagnose my potentially costly service engine soon light . Besides simply downloading the app, do I also need to purchase a cord to plug into the port under the dash or does it work via Bluetooth? I read some threads recently that identify the issue may be with my variable valve solenoid cause by oil blowbye. Do I need to remove my valve covers in order to replace the defective one(s). Is this correct? I assume the diagnostic software will tell me which bank, correct? Thoughts anyone?