Possible causes

– Faulty Air Fuel Ratio (A/F) Sensor 1 Bank 1
– Engine Control Module (ECM) program outdated
– Air Fuel Ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
– Air Fuel Ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection

Tech notes

Replacing the Air Fuel Ratio Sensor 1 Bank 1 usually takes care of the problem.

There is a service bulletin for the following Nissan Sentra:

2011 Nissan Sentra
2012 Nissan Sentra

Nissan Sentra Factory Service Bulletin OBDII Code P015B

The service bulletin suggest reprogramming the Engine Control Module (ECM) to fix the problem.

When is the code detected?

The response time of a A/F sensor 1 signal delays more than the specified time computed by Engine Control Module (ECM).

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– High Fuel Consumption
– Excessive Smoke from Exhaust

P015B NISSAN SENTRA Description

The Air Fuel Ratio (A/F) sensor 1 is a planar one-cell limit current sensor. The sensor element of the A/F sensor 1 is composed an electrode layer, which transports ions. It has a heater in the element. The sensor is capable of precise measurement