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

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3

P1273 NISSAN 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 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
    Nissan Factory Service Bulletin OBDII Code P1273

    First diagnose P1273 NISSAN code

      Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

    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.

    P1273 NISSAN Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible rough engine idle
  • P1273 NISSAN More Information

    Need more information on how to fix the P1273 NISSAN code?
    Get Access to Factory Service Manuals

    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).