AutoCodes – MINI – P0151 MINI

P0151 MINI Code - O2 Sensor Circuit Low Voltage Bank 2 Sensor 1

Quick Answer

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. Common causes include Faulty Front Heated Oxygen Sensor Bank 2, Front Heated Oxygen Sensor Bank 2 harness is open or shorted, Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0151 MINI indicates O2 Sensor Circuit Low Voltage Bank 2 Sensor 1.
Common causes: Common causes include Faulty Front Heated Oxygen Sensor Bank 2, Front Heated Oxygen Sensor Bank 2 harness is open or shorted, Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 1,904

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0151 MINI Description

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

OBDII Code P0151 MINI - O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 - AutoCodes.com — P0151 MINI Code - O2 Sensor Circuit Low Voltage Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0151 MINI?

Faulty Front Heated Oxygen Sensor Bank 2
Front Heated Oxygen Sensor Bank 2 harness is open or shorted
Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0151 MINI?

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

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0151 MINI 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 P0151 MINI code?

Need more information on how to fix the P0151 MINI code? Get Access to Factory Service Manuals

Need Help with the Code?

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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.

Frequently Asked Questions about P0151 MINI Code

1. What are the common symptoms of OBDII code P0151 on a MINI?

The common symptoms of code P0151 include poor fuel economy, rough idling, engine misfires, and a noticeable decrease in overall engine performance.

2. What does the OBDII code P0151 indicate in a MINI?

OBDII code P0151 in a MINI indicates a low voltage condition in the O2 sensor circuit of Bank 2 Sensor 1, which is the upstream oxygen sensor located before the catalytic converter.

3. What are the possible causes of the O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 code on a MINI?

Potential causes of the P0151 code on a MINI include a faulty O2 sensor, damaged wiring or connectors in the O2 sensor circuit, exhaust leaks, or a malfunctioning engine control module (ECM).

4. How can I diagnose the O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 issue on my MINI?

Diagnosing the P0151 code on a MINI involves inspecting the oxygen sensor and its wiring for any visible damage, checking for exhaust leaks, testing the sensor's voltage output, and scanning the ECM for any additional fault codes.

5. Can I drive my MINI with the OBDII code P0151 present?

It is not recommended to drive your MINI with the P0151 code active, as it can lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

6. How can I repair the O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 problem on my MINI?

Repairing the P0151 code on a MINI typically involves replacing the Bank 2 Sensor 1 oxygen sensor, repairing any damaged wiring or connectors, and clearing the fault codes from the ECM using a diagnostic tool.

7. Are there any DIY tips for fixing the OBDII code P0151 on a MINI?

While some enthusiasts may attempt to replace the oxygen sensor themselves, it is recommended to have a qualified mechanic diagnose and repair the P0151 code to ensure proper installation and accurate troubleshooting.

8. How much does it cost to fix the O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 issue on a MINI?

The cost of fixing the P0151 code on a MINI can vary depending on the root cause of the problem, but it typically ranges from $200 to $500 for parts and labor at a repair shop.

9. Will resetting the ECM clear the OBDII code P0151 on my MINI?

Resetting the ECM may temporarily clear the P0151 code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for a certain period of time.

10. How often should I replace the oxygen sensors in my MINI to prevent O2 sensor circuit-related issues like P0151?

It is recommended to replace the oxygen sensors in your MINI as part of regular maintenance every 60,000 to 90,000 miles to prevent O2 sensor circuit-related issues and ensure optimal engine performance.