VQ35DE engine up, replaced the gaskets

Question

I tuned the VQ35DE engine up,replaced all of the gaskets too. The light code is P1238 so I changed the bank 2 oxygen sensor. I drove the car 400 miles and the same code light came on. What could possibly be wrong now?

Answer 1

You mean P1283?

If one or more sensors are replaced the ECM Mixture Ratio Self-Learning clearing procedure must be perform.

Instructions: http://nissanhelp.com/diy/altima/projects/nissan_altima_clear_self_learning.php

P1283 NISSAN - Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 2

Read more: https://www.autocodes.com/p1283_nissan.html