Nissan Repair: Starting point, hi john, battery cable

Question
Have a check engine light which returns a p1148

Answer
Hi John -

Normally a code P1148 means a closed loop sensor. Since I do not have your engine info I am taking a guess. There must be something triggering it during warm up.

have you tried resetting the ECM? remove battery cable negative side for about a minute and replace.

Thanks and aloha
calvin