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

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ENGINES 272, 273 in MODEL 212 

Fig 1: Hot Film Mass Air Flow Sensor Remove/Install Components
G09974651Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
NOTES Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
1 Switch off ignition    
2 Remove air filter housing (1).   AR09.10-P-1150EWS
3 Detach vacuum line on resonance intake manifold (4) and vacuum pump and set aside Model 212.057  
4 Disconnect electrical connector (2) at hot film mass air flow sensor (B2/5)    
5 Disengage right notch (3a) for hot film mass air flow sensor (B2/5) at the resonance intake manifold (4) IMPORTANT Pull right notch (3a) upwards while doing this until it can no longer latch onto the resonance intake manifold (4).  
6 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 IMPORTANT Do not the damage the grid (A) in the process as it cannot be replaced separately!  
7 Disengage spring steel sheet (5) and remove hot film mass air flow sensor (B2/5) from the air duct housing (6) NOTES 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.  
INSPECT Checking     
8 Check seal (7) between air duct housing (6) and hot film MAF sensor (B2/5) for damage; replace if necessary    
9 Check notches (3a, 3b) and spring steel sheet (5) for damage IMPORTANT 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.  
10 Install in the reverse order    
11 Connect STAR DIAGNOSIS and read fault memory