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P1273 NISSAN

P1273 NISSAN - Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 1

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Possible 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
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Tech 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

Nissan Service Bulletin OBDII Code P1273

There are factory service bulletin for the following Nissan models:

2004 Maxima (A34) with 5 speed A/T only
2004 Quest (V42) with 5 speed A/T only
Nissan Factory Service Bulletin OBDII Code P1273

2004 Maxima (A34) with 4-speed A/T and 6-speed M/T
2004 Quest (V42) with 4-speed A/T
Nissan Factory Service Bulletin OBDII Code P1273

2005 Nissan Maxima
2005 Nissan Maxima Factory Service Bulletin OBDII Code P1273

Altima Sedan
Altima Coupe
Armada
Frontier
Cube
Maxima
Murano
Pathfinder
Quest
Rogue
Sentra
Titan
Versa
Xterra
Nissan Factory Service Bulletin OBDII Code P1273
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When is the code detected?
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
P1273 NISSAN 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).
NISSAN Technical Service Bulletins for P1273 code
2004 NISSAN ALTIMA ENGINE AND ENGINE COOLING:ENGINE Details
2004 NISSAN MAXIMA ENGINE AND ENGINE COOLING:ENGINE Details
2004 NISSAN QUEST ENGINE AND ENGINE COOLING:ENGINE Details
2005 NISSAN ALTIMA ENGINE AND ENGINE COOLING:ENGINE Details
2005 NISSAN MAXIMA ENGINE AND ENGINE COOLING:ENGINE Details
2005 NISSAN QUEST ENGINE AND ENGINE COOLING:ENGINE Details
2004 NISSAN ALTIMA 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2004 NISSAN MAXIMA 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2004 NISSAN QUEST 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2005 NISSAN ALTIMA 061000 ENGINE AND ENGINE COOLING:ENGINE Details
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