AutoCodes – Infiniti – P2A03 Infiniti

P2A03 Infiniti Code - Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1

Quick Answer

The Air Fuel Ratio (A/F) sensor is a planar dual-cell limit current sensor. Common causes include 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. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2A03 Infiniti indicates Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1.
Common causes: Common causes include 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.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 26,030

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 17, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2A03 Infiniti 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 Î»= 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 < Î» < 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 Î» = 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 - 800Â°C (1,292 - 1,472Â°F).

OBDII Code P2A03 Infiniti - Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1 - AutoCodes.com — P2A03 Infiniti Code - Air Fuel Ratio Sensor Circuit Range/Performance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P2A03 Infiniti?

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 to Fix the DTC P2A03 Infiniti?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2A03 Infiniti code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2A03 Infiniti code?

Need more information on how to fix the P2A03 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2A03 Infiniti code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.