How to Replace the MAF Sensor on Mercedes-Benz M112 V6 and M113 V8 Engines

Last updated: October 27, 2026

In this guide (5 sections)

1. Related Part Numbers
2. How to Replace the Mass Air Flow Sensor, Step by Step
3. Video: How to Diagnose and Replace a MAF Sensor
4. How to Diagnose a MAF Sensor with a Scanner
5. Applications

This guide will show you how to replace the Mercedes-Benz mass air flow (MAF) sensor.

P0100, P0101, P0102, P0103 and P0104 all point to a problem in the MAF circuit or with the sensor’s performance, and a failed sensor is the most common cause. Before replacing the sensor, inspect the connector and wiring, check the intake for leaks, review freeze frame data, and compare MAF readings with short term and long term fuel trims.

Some of the most common symptoms of a bad Mass Air Flow sensor in Mercedes-Benz cars are:

• The engine dies and stalls soon after you start it.
• The engine hesitates when you accelerate.
• Poor throttle response
• Engine hiccups
• The engine idles roughly, or fuel trim data shows a lean or rich condition.

Sometimes cleaning the sensor helps, but we recommend replacing it. While the airbox is open, check the engine air filter as well, since a filter that has been left too long is what contaminates the sensor in the first place.

Related Part Numbers

How to Replace the Mass Air Flow Sensor, Step by Step

1. Turn the ignition off and remove the key before unplugging the MAF connector. Cover the open intake connection so dirt cannot enter the engine. Remove the engine cover. Pull it up, as shown in the pictures below.
   Lift one side first.
   
2. Lift the other side and remove the whole cover.
   
3. Locate the Mass Air Flow Sensor towards the back of the engine.
   
4. Disconnect the wire harness plugged into the MAF. Press the upper and lower release tabs, then unplug the connector. It is not visible in this photo.
   
5. Remove the hose shown in the picture below. The hose will pull straight out.
   
6. Release the two plastic retaining tabs shown below.
   
7. Pull the MAF housing towards the back of the engine. As you do this, try to release the two tabs that hold it in place, as shown below. The next photo shows the housing removed so the retaining tabs are visible.
   
8. The MAF assembly comes straight out.
   
9. Replace the MAF sensor with a new one. Some replacement parts include the complete housing, which simplifies installation.
   
10. Reinstall the components in reverse order. If you want to clean the MAF sensor, you need to remove it from the housing. To do so, use pliers to remove the two screws, as shown below.
    Confirm that every intake hose, seal, electrical connector, and retaining tab is fully seated. Clear the fault codes, road test the vehicle, and verify the MAF and fuel trim readings in live data.
    

Video: How to Diagnose and Replace a MAF Sensor

How to Diagnose a MAF Sensor with a Scanner

Before replacing the MAF sensor, use the YOUCANIC UCAN-II Pro to read the engine codes and compare MAF readings with short term and long term fuel trims in live data. It includes full AI Diagnosis, built in TPMS sensor programming, a rear VIN scanning camera, coverage for 140+ makes, 3,500+ active tests, and 1,000+ special functions, with no subscription and no AutoAuth required.

In addition to providing diagnostic information, the YOUCANIC scanner can save you time and money on repairs by enabling you to perform simple fixes yourself. For example, if the check engine light is on, the scanner can assist you in identifying the problem and determining if it’s a simple issue you can address at home or if you need to take it to a mechanic. This can help you avoid unnecessary trips to the repair shop, saving you both time and money.

Applications