Question

2009 Nissan Frontier Kingcab with engine code P0138 and engine light ON

Answer 1

Hi there!

This code is for the rear O2 sensor on Bank 1. This is the passenger side rear O2 sensor after the converter. Most often replacing the sensor will resolve the problem.

Thanks

Answer 2

P0138 NISSAN - HO2S12 Circuit High Voltage

Read more: https://www.autocodes.com/p0138_nissan.html