Engine-Codes - Nissan - P2A03 2011 Nissan Pathfinder

P2A03 2011 Nissan Pathfinder Code - Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1

- Code Popularity: 2,949 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P2A03 2011 Nissan Pathfinder?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Air Fuel Ratio (A/F) Sensor Bank 2 Sensor 1
  • Air Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted
  • Air Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection
  • Fuel pressure
  • Fuel injector
  • Intake air leaks

Code Tech Notes

If the P2A03 code is set after a sensor is replaced, check for exhaust leaks and perform the mixture ratio self-learning procedure.

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How to Fix the DTC P2A03 2011 Nissan Pathfinder?

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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P2A03 2011 Nissan Pathfinder code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

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

What are Code Possible Symptoms?

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

What Does the P2A03 2011 Nissan Pathfinder Code Mean?

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 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).

P2A03 2011 Nissan Pathfinder Code - Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1

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