P2A03 - O2 Sensor Circuit Range/Performance Bank 2 Sensor 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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Possible causes

  • Air fuel ratio (A/F) sensor 1
  • Air fuel ratio (A/F) sensor 1 heater
  • Fuel pressure
  • Fuel injector
  • Intake air leaks

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 Description

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sensor. The sensor element of the A/F sensor 1 is composed an electrode

layer, which transports ions. It has a heater in the element.

The sensor is capable of precise measurement Lambda = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide Lambda range.

The exhaust gas components diffuse through the diffusion layer at the sensor cell. An electrode layer is applied voltage, and this current relative oxygen density in lean. Also this current relative hydrocarbon density in rich.

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this electrode layer of current. In addition, a heater is integrated in the

sensor to ensure the required operating temperature of about 800°C (1,472°F).

OBDII Code P2a03 - O2 Sensor Circuit Range/Performance Bank 2 Sensor 1 - AutoCodes.com

P2A03 Information for specific makes

  • P2A03 ACURA O2 Sensor Circuit Range/Performance Bank 2 Sensor 1
  • P2A03 DODGE O2 Sensor Circuit Range/Performance Bank 2 Sensor 1
  • P2A03 HONDA O2 Sensor Circuit Range/Performance Bank 2 Sensor 1
  • P2A03 INFINITI Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1
  • P2A03 LEXUS A/F Sensor Circuit Slow Response Bank 2 Sensor 1
  • P2A03 NISSAN Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1
  • P2A03 SCION A/F Sensor Circuit Slow Response Bank 2 Sensor 1
  • P2A03 TOYOTA A/F Sensor Circuit Slow Response Bank 2 Sensor 1

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P2A03 Comments

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