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

ENGINE 272, 273 in MODEL 211, 219 

Fig 1: Identifying Hot Film Mass Air Flow Sensor Remove/Install Components

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

7.9.07

Reset adaptation data - added

Step 10

	Remove/install
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
1	Turn key in ignition lock to position "0"
2	Remove air filter housing (1).		AR09.10-P-1150TS
3	Disconnect electrical connector (2) at hot film mass air flow sensor (B2/5)
4	Disengage right notch (3a) for hot film mass air flow sensor (B2/5) at the resonance intake manifold (4)	Pull right notch (3a) upwards while doing this until it can no longer latch onto the resonance intake manifold (4).
5	Unlatch left notch (3b) for hot film MAF sensor (B2/5) on the resonance intake manifold (4) and tilt hot film MAF sensor (B2/5) slightly to the rear	Do not the damage the grid (A) in the process as it cannot be replaced separately!
6	Disengage spring steel sheet (5) and remove hot film mass air flow sensor (B2/5) from the air duct housing (6)	Do not deform 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.
	Check
7	Check seal (7) between air duct housing (6) and the hot film mass air flow sensor (B2/5)	Check for damage, install new parts if necessary.
8	Check right notch (3a), left notch (3b) as well as spring steel sheet (5)	If notches (3a, 3b) are damaged, then the entire hot film MAF sensor (B2/5) must be replaced with a new one. If the spring steel sheet (5) is damaged, then the entire air duct housing (6) must be replaced.
9	Install in the reverse order
10	Read out fault memory and reset adaptation data
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A