Q: 2006 maXima lights ses light on car runs only in 5th gear but code crank pos sen on 2006 Nissan Maxima

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crankshaft position sensor code can reset by pulling off batt cables
(1) Answer
resetting a code never fixes anything. it is a problem that needs to be fixed, not cleared.

there could be an issue with the sensor but a shop needs to do a real diag to confirm.

you can have them scan the ses system as well to see what are has a fault.