AutoCodes – MINI – P129D MINI

P129D MINI Code - Manifold Absolute Pressure Maximum Pressure Implausible

Quick Answer

The Engine Control Module (ECM) monitors the Manifold Absolute Pressure Sensor. Common causes include Faulty Manifold Absolute Pressure Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure Sensor 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: P129D MINI indicates Manifold Absolute Pressure Maximum Pressure Implausible.
Common causes: Common causes include Faulty Manifold Absolute Pressure Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure Sensor 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 2,681

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 12, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P129D MINI Description

The Engine Control Module (ECM) monitors the Manifold Absolute Pressure Sensor. The ECM sets the Diagnostic Trouble Code (DTC) when the Manifold Absolute Pressure Sensor is not to factory specifications.

OBDII Code P129D MINI - Manifold Absolute Pressure Maximum Pressure Implausible - AutoCodes.com — P129D MINI Code - Manifold Absolute Pressure Maximum Pressure Implausible

What does this mean?

What are the Possible Causes of the DTC P129D MINI?

Faulty Manifold Absolute Pressure Sensor
Manifold Absolute Pressure Sensor harness is open or shorted
Manifold Absolute Pressure Sensor circuit poor electrical connection

How to Fix the DTC P129D 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P129D 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 P129D MINI code?

Need more information on how to fix the P129D MINI code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P129D 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 P129D MINI Code

1. What are the common symptoms of OBDII code P129D in a MINI?

- Common symptoms include reduced engine performance, rough idling, and potentially stalling of the vehicle.

2. What can cause the OBDII code P129D in a MINI?

- The code P129D typically indicates an issue with the manifold absolute pressure (MAP) sensor or a problem with the intake system, such as a vacuum leak.

3. How can I diagnose the cause of OBDII code P129D in my MINI?

- You can start by checking the MAP sensor for any signs of damage or corrosion. Inspect the intake system for leaks or loose connections. Consider using a diagnostic tool to monitor the sensor's readings.

4. Can a dirty air filter trigger code P129D in a MINI?

- Yes, a dirty or clogged air filter can disrupt the airflow to the engine, affecting the MAP sensor readings, and potentially triggering the code P129D.

5. What are some repair tips for resolving OBDII code P129D in a MINI?

- Start by cleaning or replacing the air filter to ensure proper airflow. Inspect the MAP sensor and its wiring for any issues. Address any vacuum leaks in the intake system.

6. Is it safe to continue driving with OBDII code P129D present in a MINI?

- It is not recommended to drive with the code P129D present, as it can lead to further engine problems and potential damage if left unaddressed.

7. Can a loose gas cap cause OBDII code P129D in a MINI?

- While a loose gas cap typically triggers a different set of codes related to the evaporative emissions system, it is still a good idea to check and ensure the gas cap is properly tightened.

8. Will resetting the OBDII system clear the P129D code in a MINI?

- Resetting the system may temporarily clear the code, but if the underlying issue causing the P129D code is not addressed, it is likely to reappear after driving the vehicle for some time.

9. How much does it typically cost to repair OBDII code P129D in a MINI?

- The cost of repair can vary depending on the exact cause of the code. Simple fixes like replacing an air filter or tightening a loose connection may be relatively inexpensive, while replacing a faulty MAP sensor can be more costly.

10. Can a DIY enthusiast fix OBDII code P129D in a MINI, or is it best left to professionals?

- Depending on the extent of your automotive knowledge and experience, some DIY enthusiasts may be able to address the issues causing the P129D code, such as checking for vacuum leaks or replacing an air filter. However, more complex repairs involving the MAP sensor or other components may be best left to professionals.