The Smog Check inspection machine doesn't read, and doesn't care about, the VIN number in your vehicle computer during an inspection. The VIN and License Plate are entered into the inspection machine by the tech for it to correspond to the DMV data base. The Smog Check machine is connected to the vehicle via the ECU connector to read it for trouble codes and completed vehicle diagnostic parameters and that's it! If those have issues, then it may not pass.
Don't stress the issue of what the VIN is in the replacement computer for a Smog Check. If the (reprogrammed) replacement computer matches your vehicle type and engine operation for proper performance and emissions, that's the main thing for a Smog Check. If the emissions are within spec, functional tests pass, visual passes, there are no codes, and the required self-tests are done, then it's no different than any other test you've had in the past.
What you 'might' consider is a "Pre-test" mode inspection considering your concerns. It is a normal test, but "unofficial". If there are issues, then in reality, the State doesn't care. If it does pass though, you will need to pay again for the Official test.
Hope this helped you with your concerns. Glenn
Sunday, November 22nd, 2020 AT 6:53 PM