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– Engine Control Module (ECM) program outdated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.

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

P015A 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