AutoCodes – Generic – P2A08

P2A08 Code - O2 Sensor Negative Voltage Bank 1 Sensor 3

Quick Answer

The Engine Control Module (ECM) monitors the O2 Sensor Negative Voltage signal. Common causes include Faulty O2 Sensor Bank 1 Sensor 3, O2 Sensor Bank 1 Sensor 3 harness is open or shorted, O2 Sensor Bank 1 Sensor 3 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: P2A08 indicates O2 Sensor Negative Voltage Bank 1 Sensor 3.
Common causes: Common causes include Faulty O2 Sensor Bank 1 Sensor 3, O2 Sensor Bank 1 Sensor 3 harness is open or shorted, O2 Sensor Bank 1 Sensor 3 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.

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Code Popularity 4,729

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 P2A08 Description

The Engine Control Module (ECM) monitors the O2 Sensor Negative Voltage signal. The ECM sets the OBDII code when the O2 Sensor Negative Voltage is out of factory specifications.

OBDII Code P2A08 - O2 Sensor Negative Voltage Bank 1 Sensor 3 - AutoCodes.com — P2A08 Code - O2 Sensor Negative Voltage Bank 1 Sensor 3

What does this mean?

What are the Possible Causes of the DTC P2A08?

Faulty O2 Sensor Bank 1 Sensor 3
O2 Sensor Bank 1 Sensor 3 harness is open or shorted
O2 Sensor Bank 1 Sensor 3 circuit poor electrical connection

How to Fix the DTC P2A08?

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 P2A08 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.