Nissan Repair Questions? Ask a Mechanic for Answers ASAP
The code P0605 is the one that caused the car to go into fail safe mode. This is why you didn't have any throttle response and it would only go 15 mph. The P0420 is a faulty catalytic code, but at this time I would be much more concerned with the computer issue. This is a tough code to diagnose only because it's possible the computer lost power and the computer itself is not the problem. This really needs to be tested with the dealer scan tool, but I suspect you will need to put a new computer in the car to resolve the issue completely. It is not a common issue but it does happen time to time.
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