AutoCodes – BMW – P129A BMW

P129A BMW Code - Charge Air Pressure Sensor Run On Pressure Implausible

Quick Answer

The Engine Control Module (ECM) monitors the Charge Air Pressure Sensor. Common causes include Faulty Charge Air Pressure Sensor, Charge Air Pressure Sensor harness is open or shorted, Charge Air 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: P129A BMW indicates Charge Air Pressure Sensor Run On Pressure Implausible.
Common causes: Common causes include Faulty Charge Air Pressure Sensor, Charge Air Pressure Sensor harness is open or shorted, Charge Air 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 4,223

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 Sep 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P129A BMW Description

The Engine Control Module (ECM) monitors the Charge Air Pressure Sensor. The ECM sets the OBDII code when the Charge Air Pressure Sensor is not to factory specifications.

OBDII Code P129A BMW - Charge Air Pressure Sensor Run On Pressure Implausible - AutoCodes.com — P129A BMW Code - Charge Air Pressure Sensor Run On Pressure Implausible

What does this mean?

What are the Possible Causes of the DTC P129A BMW?

Faulty Charge Air Pressure Sensor
Charge Air Pressure Sensor harness is open or shorted
Charge Air Pressure Sensor circuit poor electrical connection

How to Fix the DTC P129A BMW?

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 P129A BMW 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 P129A BMW code?

Need more information on how to fix the P129A BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P129A BMW 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 P129A BMW Code

1. What are the common symptoms of OBDII code P129A in a BMW related to the Charge Air Pressure Sensor Run On Pressure Implausible issue?

- Common symptoms include reduced engine power, poor acceleration, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code P129A in a BMW?

- The code P129A can be triggered by issues such as a faulty charge air pressure sensor, damaged wiring, or a problem with the engine control module.

3. How can I diagnose the Charge Air Pressure Sensor Run On Pressure Implausible issue in my BMW?

- Diagnosis involves using an OBDII scanner to read the code, checking the charge air pressure sensor for proper operation, and inspecting the wiring for any damage.

4. Can I still drive my BMW with the P129A code present?

- It is not recommended to drive your BMW with the P129A code active, as it can lead to further damage and potential safety hazards due to reduced engine performance.

5. Is it possible to reset the P129A code in my BMW without making any repairs?

- While you can clear the code temporarily using an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from reoccurring.

6. How much does it typically cost to repair the Charge Air Pressure Sensor Run On Pressure Implausible issue in a BMW?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $200 to $500 for parts and labor.

7. Can I replace the charge air pressure sensor in my BMW myself?

- Replacing the charge air pressure sensor can be a challenging task that requires some mechanical knowledge and the right tools. It is recommended to consult a professional mechanic for this repair.

8. Are there any preventive measures I can take to avoid the P129A code in my BMW?

- Regular maintenance, such as checking the charge air pressure sensor and wiring for any signs of wear, can help prevent issues that may trigger the P129A code.

9. How long does it take to repair the Charge Air Pressure Sensor Run On Pressure Implausible issue in a BMW?

- The repair time can vary depending on the exact cause of the problem and the availability of parts, but it typically takes a few hours to a full day to complete the repair.

10. Will the P129A code cause my BMW to fail an emissions test?

- Yes, the P129A code can cause your BMW to fail an emissions test as it indicates a problem with the charge air pressure sensor, which affects engine performance and emissions output.