Mercedes Diagnose & Replace Mass Air Flow Sensor

If you drive a Mercedes vehicle long enough or drive different Mercedes vehicles over time you will one day be plagued with a check engine light that is tripped because of the Mass Air Flow Sensor going bad.  This problem is easy to diagnose, easy to change.  Symptoms can vary from no noticeable difference in engine performance to an engine that is under powered especially under hard acceleration.  Other symptoms are: poor gas mileage, an engine that has an erratic rev at idle to an engine that stumbles instead of having a smooth idle. 

As always, your safety should be the number focus on any vehicle repair.  In this DIY job you will be coming into contact with oil, a hot engine and the cooling fan.

Safety Rules

1. Use gloves and goggles to protect your hands and eyes.
2. No loose clothing that can get caught in the cooling fan.
3. Do this Job when the engine has cooled to eliminate burning yourself. 

Tools Needed

1. Phillips Screw Driver.
2. OBD Scan tool (You can have an auto store scan it for you)
3. Metric Socket set 

Parts Needed

1. New Air-Mass-Flow Sensor with housing

Procedure and Video

1. Start by having the vehicle scanned for error codes via the OBD port
2. Open the hood and locate the Mass Air Flow Sensor
3. Disconnect the wire harness from the MAFS
4. Loosen the connecting the clamps
5. Remove MAFS and Replace it with new one
6. Watch the video for all of these steps plus more

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Copyright info:  All content including the video on YouTube are created and owned by myself.  Please feel free to link to this DIY page and reference my video on YouTube as well.