You should draw the system and make a genuine FMEA, Failure Mode Effect Analysis. That study will show the weak points in the design.
As @PerryBebbington tells certain measures can be taken regarding bad sensor value. What about the controller itself? If it fails, hangs... ?
I say that making sure, what ever You build, is that every solder, connection, cable, cabling, is done according to good practise is very important.
Installing redundancy increases the risk for failure a bit.
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