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

Be sure to subscribe to my you-tube channel for more car repairs and also feel free to post comments and ask questions.  I'll try to respond as quickly as possible.

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.

Mercedes DIY Thermostat Replacement

Replacing a thermostat on your Mercedes vehicle is a job that can be accomplished if you have patience, the right tools, and most of all a step by step video.  This job typically costs $450 - $700 if done by a mechanic (at the time that I wrote this blog).  If you are up for a job that is intermediary in skill set, this is the job for you.

As always, your safety should be the number focus on any vehicle repair especially when it involves working on an engine that is hot, involves moving parts (i.e. electric fan, pulleys, belts)

Safety Rules

1. Clean flat solid surface (Dirt floors, grass, sloped driveways don't qualify)
2. Use gloves and goggles to protect your hands and eyes
3. Work on the engine after it has cooled down.

Tools Needed

1. Star Wrench set
2. Socket Wrench and millimeter socket set
3. Breaker Bar
4. Container to capture coolant
5. Hose for coolant nipple on drain plug

Required

1. Coolant Flush after job is complete

Parts Needed

1. Thermostat

Procedure and Video

1. Engage Safety brake and Jack up vehicle - front driver side
2. Open hood and remove coolant filler cover from reservoir
3. Remove bottom engine cover 
4. Place hose on coolant bleed nipple placing the other end into storage container
5. Open bleed plug
6. Drain out contents until it is empty
7. Remove Pulley
8. Watch the entire process in my YouTube video below

Be sure to subscribe to my you-tube channel for more car repairs and also feel free to post comments and ask questions.  I'll try to respond as quickly as possible.

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.