AutoCodes – BMW – P1424 BMW

P1424 BMW Code - Mass Or Volume Air Flow Too High

Quick Answer

Depending on engine speed, valve-lift, inlet camshaft position, outlet camshaft position, and manifold pressure an air mass flow into the cylinder is calculated. Common causes include Faulty Mass Air Flow Sensor, Vacuum leak induction system, Mass Air Flow Sensor harness is open or shorted. 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: P1424 BMW indicates Mass Or Volume Air Flow Too High.
Common causes: Common causes include Faulty Mass Air Flow Sensor, Vacuum leak induction system, Mass Air Flow Sensor harness is open or shorted.
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 16,550

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 11, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1424 BMW Description

Depending on engine speed, valve-lift, inlet camshaft position, outlet camshaft position, and manifold pressure an air mass flow into the cylinder is calculated. There is also a correction of the calculated air mass flow depending on intake air temperature, coolant temperature, and ambient pressure. The ratio between the measured air mass flow and the calculated air mass flow must be between adjustable MIN/MAX-values. If the MIN/MAX thresholds are exceeded, a time counter is incremented. After this counter reaches the threshold within one diagnosis cycle, an air mass flow meter malfunction is detected. The Diagnostic Trouble Code (DTC) sets when the Mass Air Flow Sensor signal value is too high.

OBDII Code P1424 BMW - Mass Or Volume Air Flow Too High - AutoCodes.com — P1424 BMW Code - Mass Or Volume Air Flow Too High

What does this mean?

What are the Possible Causes of the DTC P1424 BMW?

Faulty Mass Air Flow Sensor
Vacuum leak induction system
Mass Air Flow Sensor harness is open or shorted
Mass Air Flow Sensor circuit poor electrical connection

How to Fix the DTC P1424 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 P1424 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.

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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 P1424 BMW Code

1. What does code P1424 mean on a BMW?

Code P1424 indicates "Mass or Volume Air Flow Too High," meaning the engine control module (ECM) has detected excessive airflow readings from the mass air flow (MAF) sensor.

2. What are the common symptoms of code P1424 on a BMW?

Symptoms may include poor engine performance, rough idling, decreased fuel efficiency, black exhaust smoke, and an illuminated check engine light.

3. What causes code P1424 on a BMW?

Common causes include a faulty MAF sensor, air intake leaks, a clogged or damaged air filter, or incorrect sensor signals due to wiring issues.

4. How can I diagnose code P1424 on my BMW?

Inspect the MAF sensor for dirt or damage, check for air intake leaks, ensure the air filter is clean, and use a scan tool to monitor live airflow data for abnormalities.

5. Can a dirty air filter trigger code P1424 on a BMW?

Yes, a clogged or dirty air filter can restrict airflow, causing inaccurate readings from the MAF sensor and triggering this code.

6. How do I fix code P1424 on a BMW?

Possible fixes include cleaning or replacing the MAF sensor, repairing air intake leaks, replacing the air filter, and inspecting wiring and connectors for damage.

7. Can driving with code P1424 damage my BMW?

Driving with this code may lead to poor fuel efficiency and engine performance over time, but immediate damage is unlikely unless the issue causes severe running problems.

8. How much does it cost to repair code P1424 on a BMW?

Repair costs vary but typically range from $50 to $300, depending on whether the MAF sensor or other components like the air filter need replacement.

9. Can I clean the MAF sensor to fix code P1424 on a BMW?

Yes, cleaning the MAF sensor with a specialized cleaner may resolve the issue if dirt buildup is causing incorrect airflow readings.

10. Do I need professional help to fix code P1424 on my BMW?

While some fixes, like cleaning the MAF sensor or replacing the air filter, can be DIY, more complex issues, such as wiring problems, may require professional assistance.