Remove/install hot film mass air flow sensor - AR07.07-P-1453VA

ENGINE 272.942 in MODEL 171.454 

ENGINE 272.963 in MODEL 171.456 

Fig 1: Identifying Hot Film Mass Air Flow Sensor Components

Courtesy of MERCEDES-BENZ USA

	Remove/Install
	Risk of injury  caused by fingers being jammed or pinched  when removing, installing or aligning hoods, doors, trunk lid/ rear-end door or sliding roof.	When moving components, ensure that no body parts or limbs are within the operating range of moving parts.	-
1	Open engine hood		AR88.40-P-1000V
2	Remove air filter housing		AR09.10-P-1150VA
3	Unplug connector (1) of hot film mass air flow sensor (B2/5)
4	Disengage the bracket (2) of the hot film MAF sensor (B2/5) on the right at the resonance intake manifold (3)	Whilst doing so, pull the bracket (2) upwards until it cannot latch back in.
5	Disengage the retaining spring (4)	In doing so, pull the hot film MAF sensor (B2/5) up as far as possible until the retaining spring (4) cannot latch back in.
6	Disengage the bracket (2) for the hot film MAF sensor (B2/5) at the left of the resonance intake manifold (3) and remove the hot film MAF sensor (B2/5) from the air intake connection (5)	Installation:  Check the sealing ring between air intake connection (5) and hot film mass air flow sensor (B2/5), replace if necessary. Check the bracket (2) of the hot film MAF sensor (B2/5) and the retaining spring (4), if necessary, replace the bracket (2) or air intake connection (5).
7	Install in the reverse order
8	Read out fault memory	STAR DIAGNOSIS diagnosis system	*WH58.30-Z-1048-13A
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A