Removing/installing the hot film mass air flow sensor - AR07.07-P-1453SX

ENGINE 272, 273 in MODEL 221 

ENGINE 273 in MODEL 216 

Shown on engine 273 

Fig 1: Identifying Hot Film MAF Sensor Components

Courtesy of MERCEDES-BENZ USA

	Removing/installing
1	Switch off ignition
2	Remove air filter housing (1).		AR09.10-P-1150SX
3	Remove the electrical connector (2) at the hot film mass air flow sensor (B2/5)
4	Disengage the right notch (3a) of the hot film mass air flow sensor (B2/5) at the resonance intake manifold (4)	In doing so pull right notch (3a) upwards enough so that it cannot latch again on the resonance intake manifold (4).
5	Unlatch left notch (3b) for hot film mass air flow sensor (B2/5) on resonance intake manifold (4) and tip hot film mass air flow sensor (B2/5) somewhat to the rear	Do not the damage the grid (A) in the process as it cannot be replaced separately!
6	Disengage the spring steel sheet (5) and remove the hot film mass air flow sensor (B2/5) from the air duct housing (6)	Do not deform the spring steel sheet (5) in the process permanently; it will not get locked properly at the hot film mass air flow sensor (B2/5) during installation.
	Checking
7	Check the gasket (7) between the air duct housing (6) and the hot film mass air flow sensor (B2/5) for damage
8	Check right and left notch (3a, 3b) as well as spring steel sheet (5) for damage
9	Install in reverse order
10	Read out fault memory
	Connect up STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A