A lot installers do only set the system up on idle and totaly rely on the OBD connection adjusting the fueling to the correct position. They do not even drive it at all!
You don't need a rolling road but you do need to drive it and take live data from teh OBD port to ensure the fuel trims are within tolerance and it does drive as it should. The cars fuel system is still in control and adjusts the mix as it wants it while in closed loop for pre wide band sensor cars.
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