AutoCodes – Generic – P3025

P3025 Code - Upstream Oxygen Sensor Signal Controller Monitoring Initialization Error Bank 2 Sensor 1

Quick Answer

This function will detect an error during the initialization and/or operation of a WRAF sensor controller through SPI communication. Common causes include Faulty Upstream Oxygen Sensor Bank 2 Sensor 1, Upstream Oxygen Sensor Bank 2 Sensor 1 harness is open or shorted, Upstream Oxygen 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: P3025 indicates Upstream Oxygen Sensor Signal Controller Monitoring Initialization Error Bank 2 Sensor 1.
Common causes: Common causes include Faulty Upstream Oxygen Sensor Bank 2 Sensor 1, Upstream Oxygen Sensor Bank 2 Sensor 1 harness is open or shorted, Upstream Oxygen 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.

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Code Popularity 1,359

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P3025 Description

This function will detect an error during the initialization and/or operation of a WRAF sensor controller through SPI communication. Information communicated from the Basic Software (BSW) is used for initialization and communication between Application Software (ASW) and the controller. This is used to determine if the function is working properly.
After an ECU reset, the WRAF sensor controller is started and the diagnosis determines whether the initialization has been performed in the allowed time. If not successful, then a DTC will be stored. If this is successful, then the difference is checked between the present error counter and the stored value of this error counter at ECU reset, (switching from Key

OBDII Code P3025 - Upstream Oxygen Sensor Signal Controller Monitoring Initialization Error Bank 2 Sensor 1 - AutoCodes.com — P3025 Code - Upstream Oxygen Sensor Signal Controller Monitoring Initialization Error Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P3025?

Faulty Upstream Oxygen Sensor Bank 2 Sensor 1
Upstream Oxygen Sensor Bank 2 Sensor 1 harness is open or shorted
Upstream Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection

How to Fix the DTC P3025?

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 P3025 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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Information for Specific Makes

P3025 BMW — Upstream Oxygen Sensor Signal Controller Monitoring Initialization Error Bank 2 Sensor 1
P3025 MINI — Upstream Oxygen Sensor Signal Controller Monitoring Initialization Error Bank 2 Sensor 1

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.