W221 Mass Air Flow Sensor and ABS
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Newbie
Joined: Jul 2021
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WDD221
W221 Mass Air Flow Sensor and ABS
Engine check light(MIL), ABS and ESP lights are turned on, i brought the car to local Mercedes dealer, after running diagnostic they suggest me to change all wheel speed sensor, Spark Plugs, Ignition coil and mass airflow sensor.
Do i need to reprogram the car after mass airflow sensor ?
Do i need to reprogram the car after mass airflow sensor ?
Super Member
Joined: Aug 2017
Posts: 520
Likes: 203
From: Scottsdale AZ
2015 SL550 & 2012 S550 4matic
I had the same lights come on. Diagnosed as Speed Sensor failure on passenger side. I replaced both sides in front, $25 each on-line. Take the wheel off, 2 clips and disconnect. EZ diy, no programming, resets required. Once the new sensor starts working (on your test drive) the lights go out.
Too me, the other things quoted are "extra" and not needed for this light (unless you have additional fault codes, that is). Would not be the first time a dealer "grossed up the invoice" by adding unnecessary items.
Ask to see the exact diagnostic codes that were produced by their MB Star Xentry system before any repairs or parts are purchased.
I do not thing a MAF needs programming, but not 100% on this. Normally coding is required on engine/tranny and some anti-theft parts (ignition, etc.).
Too me, the other things quoted are "extra" and not needed for this light (unless you have additional fault codes, that is). Would not be the first time a dealer "grossed up the invoice" by adding unnecessary items.
Ask to see the exact diagnostic codes that were produced by their MB Star Xentry system before any repairs or parts are purchased.
I do not thing a MAF needs programming, but not 100% on this. Normally coding is required on engine/tranny and some anti-theft parts (ignition, etc.).
Member
Joined: Jan 2011
Posts: 212
Likes: 70
2003 S55 (SOLD) , 2012 S550
Before you replace the sensor
Take the wheels off and take the sensor out and look closely at the reluctor ring.....the oem brake pads are very soft and i have had it twice that the dust filled some holes and after driving through some standing water it clogged the holes and the sensor did not see correctly. Cleaned the sensor and the ring and everything was fine again.
Ultimately i changed to akebono pads and it never happened again.
Good luck
Take the wheels off and take the sensor out and look closely at the reluctor ring.....the oem brake pads are very soft and i have had it twice that the dust filled some holes and after driving through some standing water it clogged the holes and the sensor did not see correctly. Cleaned the sensor and the ring and everything was fine again.
Ultimately i changed to akebono pads and it never happened again.
Good luck
Senior Member
Joined: Aug 2018
Posts: 307
Likes: 61
S350 2008
Before you replace the sensor
Take the wheels off and take the sensor out and look closely at the reluctor ring.....the oem brake pads are very soft and i have had it twice that the dust filled some holes and after driving through some standing water it clogged the holes and the sensor did not see correctly. Cleaned the sensor and the ring and everything was fine again.
Ultimately i changed to akebono pads and it never happened again.
Good luck
Take the wheels off and take the sensor out and look closely at the reluctor ring.....the oem brake pads are very soft and i have had it twice that the dust filled some holes and after driving through some standing water it clogged the holes and the sensor did not see correctly. Cleaned the sensor and the ring and everything was fine again.
Ultimately i changed to akebono pads and it never happened again.
Good luck
I will clean the reluctor ring and hope it help.
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
Engine check light(MIL), ABS and ESP lights are turned on, i brought the car to local Mercedes dealer, after running diagnostic they suggest me to change all wheel speed sensor, Spark Plugs, Ignition coil and mass airflow sensor.
Do i need to reprogram the car after mass airflow sensor ?
Do i need to reprogram the car after mass airflow sensor ?
I had this happen just a couple of months ago. It is in thread “Christmas tree lit up” in this forum. My problem was the front left wheel speed sensor and it made errors in half dozen different control modules in the car. That is why you have many things disabled with just one sensor. I have the iCarsoft scanner and in each module where there was an error code it mentioned the left front wheel speed sensor so I replaced it and problem is gone.
The only thing that makes sense in your dealer’s suggestion is to replace all four sensors as they may just start “popping” one-by-one after the first one went out. Rest of it is them just creating business for themselves from unnecessary work on the car.
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