Engine-Codes - Nissan - P2A03 2010 NISSAN PATHFINDER

P2A03 2010 NISSAN PATHFINDER - Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P2A03 2010 NISSAN PATHFINDER Possible 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

How is the P2A03 2010 NISSAN PATHFINDER code repair?

Start by checking 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.

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.

What is the cost to diagnose the P2A03 2010 NISSAN PATHFINDER code

Labor: 1.0

The cost to diagnose the P2A03 2010 NISSAN PATHFINDER code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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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.

Possible Symptoms

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

P2A03 2010 NISSAN PATHFINDER 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 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).

More Information

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