The lawyers are already addressing the accessibility problem....
SB1146 passed in CA which gives:
1) Car companies must make all manuals, TSBs and training material regarding emissions-related systems available to the aftermarket as well as to their franchised dealers.
2) Car companies must make enhanced diagnostic tools and the information necessary to include enhanced diagnostic capabilities available to the independent aftermarket.
3) ,,,, must make available ... ability to reprogram computer chips on .... vehicles.
4) ... car companies may not use any access or recognition code, or any type of encryption for the purpose of preventing the vehicle owner from using an emissions related part that has not been manu'd by the car company. (This, however, exempts the ECU and Transmission control module.)
5) .... must provide initialization procedures for anti-theft systems ....
6) .... must provide all at a "fair, reasonable, and nondiscriminatory" price and in a format that is readily accessible to everyone in the aftermaket.
Further CARB will be on their but if they don't comply. (I wouldn't want to be them....)
This is expected to flow into all the other states.
The next year should be interesting.
(Of course, The Aftermarket, may try to keep things secret from us owners just like the manu's. I suppose there will be some certification process to acquire Aftermaket Status.....)
This will probably result in a big mess....