Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
Hi,Before doing anything else I would try a new genuine Mitsubishi crank sensor in there. The fault code alone leading up to it is usually reason enough, and then having the unusual behavior after replacing it is a strong warning sign something went wrong there. These vehicles are extremely particular about their crank sensors (or any hall-effect type sensor) and can not use aftermarket sensors in any capacity (even ones sold at places like OReilly that swear they are Mitsubishi sensor... they are not). Using them will just about always produce unwanted results including a bunch of strange fault codes.
Lets try that first, since the change in condition forming after it was replaced is a very strong indicator of something relevant. If no change, then I would be carefully examining the wiring to make sure nothing got pinched or stretched, that the ground wire by the alternator is intact, etc.
If the engine was recently replaced, I would pay attention to all wiring for damage. For example the crank sensor wire where it drops around the bell housing is common to get pinched there etc.