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P1273 Nissan Code - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring

- Code Popularity: 1,801,950 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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By - Updated Oct 07, 2022
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|Code 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

|How do I Fix the Code P1273 Nissan?

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 connector's pins.

Does your Nissan have Safety Recalls? → Check here

|Code 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

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

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|What is the Cost to Diagnose the Code P1273 Nissan?

Labor: 1.0

The cost of diagnosing the P1273 Nissan code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|When is the Code P1273 Nissan 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.

|What are Code P1273 Nissan Possible Symptoms?

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

|Code 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).

OBDII Code P1273 Nissan - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring -
P1273 Nissan Code - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring

|Need More Information on the P1273 Nissan Code?

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

|Need Help with the P1273 Nissan Code?

Get the P1273 Nissan code diagnosed by a professional: Find a repair shop in your area

|Code P1273 Nissan comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P1273 Nissan code? Have you replaced any parts?
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