Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
If one or more sensors are replaced the Engine Control Module (ECM) Mixture Ratio Self-Learning clearing procedure must be performed.
Sentra ECM Self-Learning procedure
Altima ECM Self-Learning procedure
Maxima ECM Self-Learning procedure
There are factory service bulletins for the following Nissan models:
2004 Maxima (A34) with 5 speed A/T only
2004 Quest (V42) with 5 speed A/T only
2004 Nissan Maxima, Quest 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
2004 Nissan Maxima, Quest Factory Service Bulletin OBDII Code P1273
2005 Nissan Maxima
2005 Nissan Maxima Factory Service Bulletin OBDII Code P1273
Nissan Altima Sedan
Nissan Altima Coupe
Nissan Armada
Nissan Frontier
Nissan Cube
Nissan Maxima
Nissan Murano
Nissan Pathfinder
Nissan Quest
Nissan Rogue
Nissan Sentra
Nissan Titan
Nissan Versa
Nissan Xterra
Nissan Factory Service Bulletin OBDII Code P1273
To diagnose the P1273 Nissan code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the lean side for a specified period.
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).
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