AutoCodes – Honda – P2A03 Honda

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

Quick Answer

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sensor. Common causes include Air fuel ratio (A/F) sensor 1, Air fuel ratio (A/F) sensor 1 heater, Fuel pressure. 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 Honda indicates O2 Sensor Circuit Range/Performance Bank 2 Sensor 1.
Common causes: Common causes include Air fuel ratio (A/F) sensor 1, Air fuel ratio (A/F) sensor 1 heater, Fuel pressure.
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.

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Code Popularity 9,869

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
Cost to Diagnose
Comments
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Code P2A03 Honda 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 800Â°C (1,472Â°F).

OBDII Code P2A03 Honda - O2 Sensor Circuit Range/Performance Bank 2 Sensor 1 - AutoCodes.com — P2A03 Honda Code - O2 Sensor Circuit Range/Performance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P2A03 Honda?

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

How to Fix the DTC P2A03 Honda?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2A03 Honda 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.

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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.