Mass air flow sensor - Revision history

Pokseva: note about Chinese MAF reliability

2022-09-03T13:50:03Z

note about Chinese MAF reliability

← Older revision		Revision as of 13:50, 3 September 2022
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	\|[[File:W220_BOSCH_mass_air_flow_MAF_sensor_F00C2G2025.jpg\|thumb\|none\|W220 MAF sensor]]		\|[[File:W220_BOSCH_mass_air_flow_MAF_sensor_F00C2G2025.jpg\|thumb\|none\|W220 MAF sensor]]
	\|[[File:W220_MAF_sensor_Bosch_F00C2G2025.jpg\|thumb\|none\|BOSCH MAF sensor (F00C2G2025)]]		\|[[File:W220_MAF_sensor_Bosch_F00C2G2025.jpg\|thumb\|none\|BOSCH MAF sensor (F00C2G2025)]]
			\|[[File:MAF_sensor_BOSCH_F00C2G8728_397236157.jpg\|thumb\|none\|BOSCH MAF sensor (F00C2G8728) - year 2022]]
	\|}		\|}

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	The sensor itself does not have MB part number and must be purchased together with the housing A1120940048 (for M112) or A1130940048 (for M113).		The sensor itself does not have MB part number and must be purchased together with the housing A1120940048 (for M112) or A1130940048 (for M113).
	There are cheap 15 USD Chinese MAF sensors (e.g., sold on FENRIR parts store)~~, but~~ they have ~~not~~ proven to be reliable.		There are cheap 15 USD Chinese MAF sensors (e.g., sold on FENRIR parts store) and they have proven to be reliable.

	* M112: A1120940048 / BOSCH 0280217515 (100 EUR)		* M112: A1120940048 / BOSCH 0280217515 (100 EUR)

Pokseva: /* Description */

2022-07-24T20:09:18Z

Description

← Older revision		Revision as of 20:09, 24 July 2022
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	There are cheap 15 USD Chinese MAF sensors (e.g., sold on FENRIR parts store), but they have not proven to be reliable.		There are cheap 15 USD Chinese MAF sensors (e.g., sold on FENRIR parts store), but they have not proven to be reliable.

	* ~~M113~~: ~~A1130940048~~ / BOSCH ~~0280217810~~		* M112: A1120940048 / BOSCH 0280217515 (100 EUR)
	* ~~M112~~: ~~A1120940048~~ / BOSCH ~~0280217515~~		* M113: A1130940048 / BOSCH 0280217810 (115 EUR)

	==Cleaning MAF==		==Cleaning MAF==

Pokseva: /* Description */ added part numbers

2022-07-24T20:08:20Z

Description: added part numbers

← Older revision		Revision as of 20:08, 24 July 2022
Line 20:		Line 20:

	The sensor itself does not have MB part number and must be purchased together with the housing A1120940048 (for M112) or A1130940048 (for M113).		The sensor itself does not have MB part number and must be purchased together with the housing A1120940048 (for M112) or A1130940048 (for M113).
	There are cheap 15 USD Chinese MAF sensors (e.g., sold on FENRIR parts store) ~~that~~ have proven to be reliable.		There are cheap 15 USD Chinese MAF sensors (e.g., sold on FENRIR parts store), but they have not proven to be reliable.

			* M113: A1130940048 / BOSCH 0280217810
			* M112: A1120940048 / BOSCH 0280217515

	==Cleaning MAF==		==Cleaning MAF==

Pokseva: refactored and added additional information and photos

2022-07-15T16:06:54Z

refactored and added additional information and photos

← Older revision		Revision as of 16:06, 15 July 2022
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	~~Back to '''[[Index]]'''~~		==Description==
			The Mass Air Flow (MAF) sensor is also known as the air volume gauge or air mass gauge.

	~~Reference~~: ~~WIS 07~~.~~07 Air Volume Gauge, Air Mass Gauge~~		The MAF contains a hot wire sensor and an integrated temperature sensor. For a complete description refer to: http://en.wikipedia.org/wiki/Mass_flow_sensor
	~~==Description - MAF==~~
	~~The Mass Air Flow (MAF) Sensor is also known as the Air Volume Gauge or Air Mass Gauge~~.

	~~The~~ MAF ~~contains a hot wire~~ sensor. ~~For a complete description refer to~~:		This is what a MAF sensor looks like:
			{\|
			\|[[File:W220_BOSCH_mass_air_flow_MAF_sensor_F00C2G2025.jpg\|thumb\|none\|W220 MAF sensor]]
			\|[[File:W220_MAF_sensor_Bosch_F00C2G2025.jpg\|thumb\|none\|BOSCH MAF sensor (F00C2G2025)]]
			\|}

	~~http://en~~.~~wikipedia~~.~~org/wiki/Mass_flow_sensor~~		The same sensor (BOSCH F00C2G2025) is used on both [[M112]] and [[M113]] engines. However, the inner diameter for the MAF housing on M112 is smaller (see the comparison below).

	[[File:~~W220_Mass_Air_Flow_%28MAF%29_Sensor~~.~~JPG~~\|~~300px~~\|~~center~~]]		{\|
			\|[[File:W220_MAF_sensor_housing_A1120940048_vs_A1130940048.jpg\|thumb\|none\|MAF housing A1120940048 (M112) and A1130940048 (M113)]]
			\|[[File:W220_MAF_housing_A1120940048_vs_A1130940048.jpg\|thumb\|none\|MAF housing M112 vs M113]]
			\|}

	~~This is what a~~ MAF ~~looks like courtesy~~ of ~~German Star~~.		The MAF sensor will foul over time, but the [[mixture formation]] can workaround it by adapting the mixture formation. When this adaptation gets out of range, we get the typical mixture codes - such as P0170/3. The degree of "adaption" [[mixture formation\|can be seen using DAS]].

	~~[[File:W220_MAF_Sensor_Element_Courtesy_of_German_Star~~.~~JPG\|300px\|center]]~~		The sensor itself does not have MB part number and must be purchased together with the housing A1120940048 (for M112) or A1130940048 (for M113).
			There are cheap 15 USD Chinese MAF sensors (e.g., sold on FENRIR parts store) that have proven to be reliable.

	==~~Self~~ Cleaning ~~Function -~~ MAF==		==Cleaning MAF==
	~~One BenzWorld Member stated that the~~ Bosch MAFs have a cleaning cycle. During this cycle, the current is briefly increased to the hot wire sensor and this increases the temperature to something like 1000F. This is akin to a self cleaning oven.		The Bosch MAFs have a cleaning cycle. During this cycle, the current is briefly increased to the hot wire sensor and this increases the temperature to something like 1000F. This is akin to a self cleaning oven.

	~~==Issues -~~ MAF==		To clean a MAF sensor, a special MAF sensor cleaner must be used, which leaves no deposit after drying out.
	A ~~commercial~~ cleaner will remove oil and such deposits, but in the case of the Bosch MAF units, the deposit is probably more like a hard scale caused by deposits baking on.		A cleaner will remove oil and such deposits,
			but in the case of the Bosch MAF units, the deposit is probably more
			like a hard scale caused by deposits baking on.

			==Replacing MAF==
			The MAF sensor is held in place in the MAF housing with two Torx security screws which have a dimple in the center of the screws and hence a special driver is needed.

			[[File:MAF_Security_Torx_Screw_Driver.JPG\|thumb\|none\|Torx security screw driver]]

	~~==DIY - Replace MAF ==~~
	The following video shows how to replace the MAF housing:		The following video shows how to replace the MAF housing:

	{\|		{\|
	\|{{#ev:youtube\|https://youtu.be/73rXBrisqsc\|320\|center\|MAF Housing Relacement (By Masood)\|frame}}		\|{{#ev:youtube\|https://youtu.be/73rXBrisqsc\|320\|center\|MAF Housing Relacement (By Masood)\|frame}}
	\|}		\|}
			<!-- http://www.benzworld.org/forums/w210-e-class/1328069-maf-diy-pictorial-replacing-cleaning.html -->


	~~The M~~-B designers knew that the MAF will foul over time and included programming that allows it to adapt to a changing reading. When this adaptation gets out of range, we get the typical mixture codes - such as P0170/3. Dealers apparently have the ability to check the degree of "adaption" whereas all we can read with our OBD II meters, is the codes.

	~~==DIY - MAF==~~
	~~It is possible to re~~-~~use your MAF housing and just buy the Bosch insert eg for $139 from Germanstar.net. That is the cheapest in the current market.~~

	~~However the MAF is held in place with Torx Security Screws which have a dimple in the center of the screws and a special driver is needed.~~

	~~[[File:MAF_Security_Torx_Screw_Driver.JPG\|150px\|center]]~~

	~~See article on cleaning by BenzWorld Member Check Codes.~~

	http://www.benzworld.org/forums/w210-e-class/1328069-maf-diy-pictorial-replacing-cleaning.html

	~~There are heaps of other article on cleaning and replacing the MAF.~~

	~~To Be Completed.~~

Pokseva: Pokseva moved page WIS 07.07 Air Volume Gauge, Air Mass Gauge to Mass air flow sensor

2022-07-15T14:41:36Z

Pokseva moved page WIS 07.07 Air Volume Gauge, Air Mass Gauge to Mass air flow sensor

← Older revision	Revision as of 14:41, 15 July 2022
(No difference)

Masood at 20:37, 19 September 2021

2021-09-19T20:37:40Z

← Older revision		Revision as of 20:37, 19 September 2021
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	==Issues - MAF==		==Issues - MAF==
	A commercial cleaner will remove oil and such deposits, but in the case of the Bosch MAF units, the deposit is probably more like a hard scale caused by deposits baking on.		A commercial cleaner will remove oil and such deposits, but in the case of the Bosch MAF units, the deposit is probably more like a hard scale caused by deposits baking on.

			==DIY - Replace MAF ==
			The following video shows how to replace the MAF housing:

			{\|
			\|{{#ev:youtube\|https://youtu.be/73rXBrisqsc\|320\|center\|MAF Housing Relacement (By Masood)\|frame}}
			\|}



	The M-B designers knew that the MAF will foul over time and included programming that allows it to adapt to a changing reading. When this adaptation gets out of range, we get the typical mixture codes - such as P0170/3. Dealers apparently have the ability to check the degree of "adaption" whereas all we can read with our OBD II meters, is the codes.		The M-B designers knew that the MAF will foul over time and included programming that allows it to adapt to a changing reading. When this adaptation gets out of range, we get the typical mixture codes - such as P0170/3. Dealers apparently have the ability to check the degree of "adaption" whereas all we can read with our OBD II meters, is the codes.

Ricebubbles: Added link Back to Index

2016-03-28T04:49:28Z

Added link Back to Index

← Older revision		Revision as of 04:49, 28 March 2016
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			Back to '''[[Index]]'''

	Reference: WIS 07.07 Air Volume Gauge, Air Mass Gauge		Reference: WIS 07.07 Air Volume Gauge, Air Mass Gauge
	==Description - MAF==		==Description - MAF==

Ricebubbles: /* Description - MAF */

2015-03-17T11:51:01Z

Description - MAF

← Older revision		Revision as of 11:51, 17 March 2015
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	Reference: WIS 07.07 Air Volume Gauge, Air Mass Gauge		Reference: WIS 07.07 Air Volume Gauge, Air Mass Gauge
	==Description - MAF==		==Description - MAF==
	The Mass Air Flow (MAF) Sensor ~~element is~~ is also known as a hot wire sensor. For a complete description refer to:		The Mass Air Flow (MAF) Sensor is also known as the Air Volume Gauge or Air Mass Gauge.

			The MAF contains a hot wire sensor. For a complete description refer to:

	http://en.wikipedia.org/wiki/Mass_flow_sensor		http://en.wikipedia.org/wiki/Mass_flow_sensor

Ricebubbles: Moved from WIS 07.41 LH Sequential Multiport Fuel Injection System.

2015-03-17T11:47:42Z

Moved from WIS 07.41 LH Sequential Multiport Fuel Injection System.

New page

Reference: WIS 07.07 Air Volume Gauge, Air Mass Gauge
==Description - MAF==
The Mass Air Flow (MAF) Sensor element is is also known as a hot wire sensor. For a complete description refer to:

http://en.wikipedia.org/wiki/Mass_flow_sensor

[[File:W220_Mass_Air_Flow_%28MAF%29_Sensor.JPG|300px|center]]

This is what a MAF looks like courtesy of German Star.

[[File:W220_MAF_Sensor_Element_Courtesy_of_German_Star.JPG|300px|center]]

==Self Cleaning Function - MAF==
One BenzWorld Member stated that the Bosch MAFs have a cleaning cycle. During this cycle, the current is briefly increased to the hot wire sensor and this increases the temperature to something like 1000F. This is akin to a self cleaning oven.

==Issues - MAF==
A commercial cleaner will remove oil and such deposits, but in the case of the Bosch MAF units, the deposit is probably more like a hard scale caused by deposits baking on.

The M-B designers knew that the MAF will foul over time and included programming that allows it to adapt to a changing reading. When this adaptation gets out of range, we get the typical mixture codes - such as P0170/3. Dealers apparently have the ability to check the degree of "adaption" whereas all we can read with our OBD II meters, is the codes.

==DIY - MAF==
It is possible to re-use your MAF housing and just buy the Bosch insert eg for $139 from Germanstar.net. That is the cheapest in the current market.

However the MAF is held in place with Torx Security Screws which have a dimple in the center of the screws and a special driver is needed.

[[File:MAF_Security_Torx_Screw_Driver.JPG|150px|center]]

See article on cleaning by BenzWorld Member Check Codes.

http://www.benzworld.org/forums/w210-e-class/1328069-maf-diy-pictorial-replacing-cleaning.html

There are heaps of other article on cleaning and replacing the MAF.

To Be Completed.