Welcome to Club Frontier!!! Hope this response is able to help you out....

You might want to download a copy of the Nissan Factory Service Manual from any one of the weblinks below. Follow the procedures listed in the FSM to troubleshoot & diagnose the reason for the P0150 code. The FSM should have a diagram showing you where the 02 sensors, (Bank 1 & Bank 2), are located. Remember to check the wiring harness and grounds to the O2 sensors. Wires and grounds get brittle with the heat generated by the engine & along with the age of the wires & connectors.

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Thank you sir. I will give them a look and download them.

If anyone else knows more feel free to post.

 

The engine has 6cylinders arranged in two rows (banks) of 3 each. Typically the passenger side is bank 1. Driver's side is bank 2. The cylinder furthermost from the firewall is #1 on the bank 1. Same with bank 2.

The O2 sensor is located just upstream of the catalytic converter on the bank in question.