this is the hyster internal option impact sensor
The impact sensor said starter interlock impact sensor, and it seemed to clear as soon as I had entered the password for service level and exited. I also have gone back through the truck general items setup, and tried with the impact sensor both activated and deactivated. A couple of times I had an error about not being able to write the hard impact settings. but after a few attempts that error did not return.
I also note that I have a greyed out setting for "BLM" in 'bank 1 fuel control" and bank 2 fuel control. (what does the "BLM" stand for, here?)
I am now also seeing that the second O2 sensor is "na" although it has one and changing it made no differences.
I am leaning to a messed up "hard" setting in the computer, but am about to start checking "pin to pin" from the ECU.