you need a scanner or code reader, this will give you diagnostic trouble codes but it does not tell you what to repair, only which system has malfuction. if a tool was made that told you what to...
Unless you set a security code and remember what it is the dealer is your only option because of security system radios are vehicle specific when installed at factory vehicle needs to be hooked up ro...
P0205 means that the PCM detected a fault in the injector 5 or the wiring to the injector.
Could be a bad injector number 5. Maybe the wires to the injectors or the PCM is faulty.