The 651,652,653,654 codes are indicated for the Cummins diesel engine, They mean nothing to the LP engine.
522631-2 is O2 sensor failing to switch to lean, checks wires at connector, between pos. and grd. should be 5 volts, if not check between pos and frame, if voltage present grd wire broken, if yes, could be faulty O2 sensor.
522752-9 is cam sensor, test in same fashion as O2 sensor, if voltage is present, sensor may be faulty.
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