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

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ENGINE 156 in MODEL 204, 212 

Fig 1: Hot Film Mass Air Flow Sensor Remove/Install Components
G09974650Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
DANGER Risk of injury  caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, liftgates or sliding roof Keep body parts and limbs well clear of moving parts. AS00.00-Z-0011-01A
1 Remove front engine cover NOTES Do not tilt front engine cover, but lift upwards vertically otherwise the retaining lugs can break off.  
2 Remove cover from right hot film mass air flow sensor (B2/6) or left hot film mass air flow sensor (B2/7) in the upward direction    
3 Open each clamp (3)    
4 Remove right air filter housing or left air filter housing IMPORTANT The left hot film mass air flow sensor (B2/6) and the right hot film mass air flow sensor (B2/7) are each located in the top section of the air filter housing. AR09.10-P-1150CMG
5 Remove bolts (4)    
6 Disconnect top section of air filter housing (1) from bottom section of air filter housing (2) INSTALLATION IMPORTANT In case of a defect, the left hot film mass air flow sensor (B2/6) and the right hot film mass air flow sensor (B2/7) must be completely replaced with the top section of the air filter housing (1).  
7 Install in the reverse order    
DANGER Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not touch hot or rotating parts.
AS00.00-Z-0005-01A
8 Carry out engine test run