AutoCodes – MINI – P0159 MINI

P0159 MINI Code - O2 Sensor Circuit Slow Response Bank 2 Sensor 2

Quick Answer

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear 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: P0159 MINI indicates O2 Sensor Circuit Slow Response Bank 2 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,742

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0159 MINI Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0159 MINI - O2 Sensor Circuit Slow Response Bank 2 Sensor 2 - AutoCodes.com — P0159 MINI Code - O2 Sensor Circuit Slow Response Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0159 MINI?

Faulty Rear Heated Oxygen Sensor Bank 2
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear 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 P0159 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 O2 Sensor 2 usually takes care of the problem

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0159 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 P0159 MINI code?

Need more information on how to fix the P0159 MINI code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0159 MINI code diagnosed by a professional: Find a repair shop in your area

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 P0159 MINI Code

1. What are the common symptoms of OBDII code P0159 in a MINI Cooper?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

2. What does the OBDII code P0159 MINI mean?

- The code P0159 indicates a slow response from the oxygen sensor located in Bank 2 Sensor 2 of the vehicle's exhaust system.

3. What are the possible causes of O2 sensor circuit slow response code P0159 in a MINI?

- Common causes can include a faulty oxygen sensor, wiring issues, exhaust leaks, or a malfunctioning catalytic converter.

4. How can I diagnose the O2 sensor circuit slow response code P0159 in my MINI?

- Diagnosing P0159 typically involves testing the oxygen sensor, inspecting the wiring for damage, checking for exhaust leaks, and scanning for any related codes.

5. Can I drive my MINI with the O2 sensor circuit slow response code P0159?

- It is generally safe to drive the vehicle in the short term with this code, but it is recommended to address the issue promptly to prevent potential damage to the engine or catalytic converter.

6. How can I repair the O2 sensor circuit slow response code P0159 in my MINI?

- Repair options may include replacing the oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, or addressing issues with the catalytic converter.

7. Will resetting the Check Engine Light clear the OBDII code P0159 in my MINI?

- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return.

8. How much does it cost to fix the O2 sensor circuit slow response code P0159 in a MINI?

- The cost of repairs can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can a DIY enthusiast fix the O2 sensor circuit slow response code P0159 in a MINI?

- Depending on the cause of the issue, some DIY enthusiasts may be able to address the problem themselves by replacing the oxygen sensor or repairing wiring. However, more complex issues may require professional assistance.

10. How often does the O2 sensor need to be replaced in a MINI to prevent code P0159 from recurring?

- The oxygen sensor does not have a specific replacement interval, but it is recommended to follow the manufacturer's guidelines and replace it if performance issues or codes like P0159 arise.