P2A03 2006 NISSAN PATHFINDER - Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1
Possible causes
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.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
P2a03 2006 Nissan Pathfinder 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 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).
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