These trucks are an electronic nightmare. You may want to consider getting this truck running, with no codes, & then replacing it with an older model (pre- electronics). I service two of these with 5500 hours on them & they're always requiring some sort of sensor, fuel injector, fuel regulator- the list goes on & on.
If you decide to keep it, make sure you use HD-5 propane (assuming it's a LPG truck)- the lessor grade propane will cost you dearly in regulators & fuel injectors.
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