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P1274 Nissan Code - Air Fuel Ratio Sensor 1 Bank 1 Rich Shift Monitoring

- Code Popularity: 51,566 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1274 Nissan?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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
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How to Fix the DTC P1274 Nissan?

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.

Code Tech Notes

If one or more sensors are replaced the Engine Control Module (ECM) Mixture Ratio Self-Learning clearing procedure must be performed.

There is a factory service bulletin for the following Nissan models:
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 P1274

Search for P1274 Nissan Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1274 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.

When is the Code Detected?

The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the rich side for a specified period.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine Rough Idle

Code P1274 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 P1274 Nissan - Air Fuel Ratio Sensor 1 Bank 1 Rich Shift Monitoring  - AutoCodes.com
P1274 Nissan Code - Air Fuel Ratio Sensor 1 Bank 1 Rich Shift Monitoring

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