AutoCodes – Mercedes-Benz – P0103 Mercedes-Benz

P0103 Mercedes-Benz Code - Mass or Volume Air Flow Circuit High Input

Quick Answer

The Mass Air Flow (MAF) sensor is placed in the stream of the intake air. Common causes include Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor, Intake air leaks. 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: P0103 Mercedes-Benz indicates Mass or Volume Air Flow Circuit High Input.
Common causes: Common causes include Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor, Intake air leaks.
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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

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

Code Popularity 26,974

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 May 19, 2022

Description
Step-by-Step Diagnostic Guide
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 P0103 Mercedes-Benz Description

The Mass Air Flow (MAF) sensor is placed in the stream of the intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM). The ECM controls the temperature of the hot film by a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECM must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM detects the air flow by means of this current change. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the MAF Sensor Signal is more than the factory specifications.

OBDII Code P0103 Mercedes-Benz - Mass or Volume Air Flow Circuit High Input - AutoCodes.com — P0103 Mercedes-Benz Code - Mass or Volume Air Flow Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0103 Mercedes-Benz?

Dirty Air Filter
Dirty Mass Air Flow (MAF) Sensor
Intake air leaks
Faulty Mass Air Flow Sensor
Mass Air Flow Sensor harness is open or shorted
Mass Air Flow Sensor circuit poor electrical connection

How to Fix the DTC P0103 Mercedes-Benz?

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

Before replacing the Mass Air Flow (MAF) Sensor, try replacing the air filter and cleaning the Mass Air Flow Sensor with low compress air or Mass Air Flow Sensor Cleaner. Reset code and drive vehicle. If the code comes back, you must replace the Mass Air Flow Sensor to fix the problem.

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0103 Mercedes-Benz 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 P0103 Mercedes-Benz code?

Need more information on how to fix the P0103 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0103 Mercedes-Benz 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 P0103 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0103 in a Mercedes-Benz?

- Common symptoms include a decrease in fuel efficiency, rough idling, lack of power, and in some cases, the Check Engine light may illuminate.

2. What are the possible causes of OBDII code P0103 in a Mercedes-Benz?

- The code P0103 typically indicates an issue with the Mass Air Flow (MAF) sensor or its circuit. Possible causes include a faulty MAF sensor, a dirty or clogged MAF sensor, a vacuum leak, or a wiring issue.

3. How can I diagnose the OBDII code P0103 in my Mercedes-Benz?

- You can start by inspecting the MAF sensor for any dirt or debris, checking for vacuum leaks, and inspecting the wiring harness and connectors for any damage. Additionally, using a diagnostic scanner to monitor MAF sensor data can help pinpoint the issue.

4. Can I drive my Mercedes-Benz with OBDII code P0103?

- It is not recommended to drive your vehicle with a P0103 code as it can lead to poor engine performance and potential damage to other components. It's best to address the issue promptly.

5. How do I repair OBDII code P0103 in my Mercedes-Benz?

- Repairing P0103 may involve cleaning or replacing the MAF sensor, fixing any vacuum leaks, repairing damaged wiring, or resetting the code with a diagnostic scanner after addressing the underlying issue.

6. Will resetting the Check Engine light fix OBDII code P0103 in my Mercedes-Benz?

- Simply resetting the Check Engine light without addressing the underlying issue causing code P0103 will not fix the problem. It's important to diagnose and repair the root cause of the code.

7. Can a clogged air filter cause OBDII code P0103 in a Mercedes-Benz?

- A clogged air filter can indirectly contribute to code P0103 by affecting the MAF sensor's readings. It is recommended to check and replace a dirty or clogged air filter if necessary.

8. How much does it typically cost to repair OBDII code P0103 in a Mercedes-Benz?

- The cost of repairing code P0103 can vary depending on the cause of the issue, labor costs, and whether any parts need replacing. It is advisable to consult a professional mechanic for an accurate estimate.

9. Is it possible to prevent OBDII code P0103 from occurring in my Mercedes-Benz?

- Regular maintenance, such as replacing air filters as recommended, keeping the engine clean, and addressing any issues promptly, can help prevent code P0103 from occurring in your Mercedes-Benz.

10. Can a DIY enthusiast troubleshoot and repair OBDII code P0103 in a Mercedes-Benz?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to troubleshoot and repair code P0103. However, it is recommended to seek professional assistance if unsure or inexperienced in handling such repairs.