OBD-II Trouble Code Nissan P1273 – Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 1

Causes:
– Faulty Air fuel ratio (A/F) sensor 1 Bank 1
– Faulty Air fuel ratio (A/F) sensor 1 heater Bank 1
– Fuel pressure
– Faulty Fuel injector
– Intake air leaks
– Faulty Air Flow Meter

Notes:
If one or more sensors are replaced the Engine Control Module (ECM) Mixture Ratio Self-Learning clearing procedure must be perform.
Sentra ECM Self-Learning procedure
Altima ECM Self-Learning procedure
Maxima ECM Self-Learning procedure

What is the Nissan P1273 code mean?
The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the lean side for a specified period.

Symptoms:
– Engine Light ON (or Service Engine Soon Warning Light)
– Possible rough engine idle

Nissan P1273 Description:

The Air Fuel Ratio (A/F) sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.

The sensor is capable of precise measurement λ= 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide λ range (0.7 < λ < air).

The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.

An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at λ = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 – 800 C (1,292 – 1,472 F).

The OBD2 Code Information Be Applicable For the following Nissan models:

2013 Nissan Pathfinder
2013 Nissan Murano
2013 Nissan Juke Nismo
2013 Nissan GT-R
2013 Nissan Almera
2013 Nissan 370Z
2012 Nissan Versa Sedan
2012 Nissan Tiida
2012 Nissan Sunny
2012 Nissan Qashqai
2012 Nissan Murano
2012 Nissan Micra ELLE
2012 Nissan Maxima
2012 Nissan GT-R
2011 Nissan X-Trail
2011 Nissan Rogue
2011 Nissan Quest
2011 Nissan Patrol
2011 Nissan Murano
2011 Nissan Micra
2011 Nissan LEAF
2011 Nissan Juke
2011 Nissan GT-R
2011 Nissan 370Z
2010 Nissan Townpod Concept
2010 Nissan Qashqai+2
2010 Nissan Qashqai
2010 Nissan Pathfinder
2010 Nissan Navara
2010 Nissan NV200
2010 Nissan Cube
2009 Nissan Pixo
2009 Nissan Note
2009 Nissan Murano
2009 Nissan Maxima
2008 Nissan Rogue
2008 Nissan GT-R
2007 Nissan Qashqai
2007 Nissan Altima
2006 Nissan Note
2006 Nissan 350Z
2005 Nissan Xterra
2005 Nissan Terrano
2005 Nissan Primera
2005 Nissan Pickup
2005 Nissan Patrol
2005 Nissan Pathfinder
2005 Nissan Navara
2005 Nissan Murano
2005 Nissan Micra
2005 Nissan Altima
2004 Nissan Titan
2004 Nissan Tiida
2004 Nissan Sentra
2004 Nissan Quest
2004 Nissan Murano
2004 Nissan Maxima
2004 Nissan Altima

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