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

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P1273 NISSAN Possible Causes

  • Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
  • 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
  • Fuel pressure
  • Faulty Fuel injector
  • Faulty Air Flow Meter

P1273 NISSAN Tech Notes

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

Nissan Service Bulletin OBDII Code P1273

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
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

Cost of diagnosing the P1273 NISSAN code

    Labor: 1.0

    The cost of diagnosing the P1273 NISSAN code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the P1273 NISSAN 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.

P1273 NISSAN Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible rough engine idle

P1273 NISSAN Meaning

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).

OBDII Code P1273 NISSAN - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring - Engine-Codes.com

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