AutoCodes – MINI – P0155 MINI

P0155 MINI Code - O2 Sensor Heater Circuit Bank 2 Sensor 1

Quick Answer

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground. 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: P0155 MINI indicates O2 Sensor Heater Circuit Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground.
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 1,955

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 Mar 23, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0155 MINI Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM). In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

OBDII Code P0155 MINI - O2 Sensor Heater Circuit Bank 2 Sensor 1 - AutoCodes.com — P0155 MINI Code - O2 Sensor Heater Circuit Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 MINI?

Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0155 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

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0155 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.

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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 P0155 MINI Code

1. What does the OBDII code P0155 for a MINI mean?

The code P0155 indicates a malfunction in the O2 sensor heater circuit for Bank 2 Sensor 1 in a MINI vehicle.

2. What are the common symptoms of a P0155 OBDII code in a MINI?

Common symptoms of a P0155 code may include poor fuel economy, rough idling, failed emissions test, and the illumination of the check engine light.

3. What usually causes the P0155 OBDII code in a MINI?

The most common causes of a P0155 code in a MINI are a faulty O2 sensor, damaged wiring or connectors in the heater circuit, or a blown fuse related to the O2 sensor heater.

4. How can I diagnose a P0155 OBDII code in my MINI?

To diagnose a P0155 code, you can use an OBDII scanner to read the code and then inspect the O2 sensor, wiring, and related components for any visible damage or issues.

5. Can I still drive my MINI with a P0155 OBDII code?

It is generally not recommended to drive your MINI with a P0155 code as it can lead to poor engine performance and potentially cause further damage to the vehicle.

6. How can I repair a P0155 OBDII code in my MINI?

Repairing a P0155 code typically involves replacing the Bank 2 Sensor 1 O2 sensor, repairing any damaged wiring or connectors, and checking and replacing any blown fuses.

7. Are there any DIY tips for fixing a P0155 OBDII code in a MINI?

While replacing the O2 sensor and checking the wiring can be done by a skilled DIYer, it is recommended to consult a professional mechanic for proper diagnosis and repair of a P0155 code.

8. How much does it cost to fix a P0155 OBDII code in a MINI?

The cost of fixing a P0155 code in a MINI can vary depending on the exact cause of the issue, but it typically ranges from $200 to $500 for parts and labor.

9. Can a P0155 OBDII code be triggered by something other than a faulty O2 sensor?

Yes, a P0155 code can also be triggered by issues such as a damaged heater circuit, blown fuse, or wiring problems related to Bank 2 Sensor 1 in a MINI.

10. How can I prevent a P0155 OBDII code from recurring in my MINI?

To prevent a P0155 code from recurring, it's important to perform regular maintenance checks on the O2 sensors, heater circuits, and related components in your MINI to ensure they are functioning properly.