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Home >> Mercedes Benz >> 2012 >> GLK350 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Ignition System >> Mixture Formation - 204 Chassis - 1 Of 2 >> Testing & Repair >> Remove/install heated O2 sensor >> Remove/install heated O2 sensor - AR07.52-P-5303FH
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Remove/install heated O2 sensor - AR07.52-P-5303FH

ENGINES 276 in MODEL 204, 207 

Fig 1: Identifying Heated O2 Sensor Remove/Install Components - Shown On Model 204.057
G09990088Courtesy of MERCEDES-BENZ USA

Shown on model 204.057 

Shows model 204.057 

Fig 2: Identifying Heated O2 Sensor Remove/Install Components - Shown On Model 204.057
G09990089Courtesy 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
DANGER Risk of death  caused by vehicle slipping or toppling off of the lifting platform. Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer. AS00.00-Z-0010-01A
1 Switch off ignition    
2 Remove front engine cover (1)    
3 Remove air filter housing (2). To remove RH oxygen sensor (G3/4) upstream of the CAT  
TORQUE SPECIFICATION *BA09.10-P-1001-01M 
TORQUE SPECIFICATION *BA09.10-P-1002-01M 
4 Unclip electrical lines (11) for the ME-SFI [ME] control unit (N3/10) on vacuum reservoir (4) or on bracket for the ME-SFI [ME] control unit (N3/10) To remove LH oxygen sensors (G3/3, G3/5)  
5 Remove ME-SFI [ME] control unit (N3/10) from bracket and put to one side with electrical lines (11) connected Only for vehicles with engine 276, to remove the LH oxygen sensors (G3/3, G3/5) AR07.08-P-7008FH 
  Oxygen sensor downstream of CAT (G3/5 or G3/6)     
6 Remove engine compartment paneling Model 207, 204 except model 204.9 AR61.20-P-1105EW
Model 204.9 AR61.20-P-1105CY
7 Unclip electrical connector (6 or 8) at bracket and disconnect    
8 Unclip electrical line (10) on shield (13) and crankcase To remove left oxygen sensor (G3/5)  
9 Remove oxygen sensor (G3/5 or G3/6) from CAT INSTALLATION IMPORTANT Coat thread with heat- resistant lubricant. Ensure correct routing of oxygen sensor lines.  
TORQUE SPECIFICATION *BA14.00-P-1002-01A 
SPECIAL TOOL Figure
Paste *BR00.45-Z-1005-06A 
  Remove oxygen sensor upstream of CAT (G3/3 or G3/4)     
10 Remove vacuum reservoir (4) if installed, to remove the LH oxygen sensor (G3/3)  
TORQUE SPECIFICATION *BA43.05-P-1002-01K 
11 Unclip electrical line (12) on bracket for air filter housing (2) To remove LH oxygen sensor (G3/4)  
12 Unclip electrical connector (7 or 9) at bracket and disconnect    
13 Remove oxygen sensor (G3/3 or G3/4) from CAT INSTALLATION IMPORTANT Coat thread with heat- resistant lubricant. Ensure correct routing of the electrical line for the oxygen sensors (G3/3 or G3/4).  
TORQUE SPECIFICATION *BA14.00-P-1005-01A 
SPECIAL TOOL Figure
Paste *BR00.45-Z-1005-06A 
14 Install in the reverse order    
15 Read out fault memory with STAR DIAGNOSIS and erase if necessary   AD00.00-P-2000-04A
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
16 Test run engine and check exhaust system for leaks
O2 SENSOR

Number Designation Engine 276
BA14.00-P-1002-01A O2 sensor on catalytic converter Nm 50
BA14.00-P-1004-01A Diagnostic sensor downstream of catalytic converter Nm -
BA14.00-P-1005-01A Control sensor upstream of catalytic converter Nm 50
VACUUM PUMP

Number Designation Engine 276
BA43.05-P-1002-01K Bolt, vacuum reservoir to bracket Nm 9
AIR FILTER

Number Designation Engine 276
BA09.10-P-1001-01M Bolt, air filter to cylinder head cover Nm 9
BA09.10-P-1002-01M Bolt, air filter to air intake pipe support brace Nm 9
Fig 3: Identifying Box Wrench Bit (000 589 71 03 00)
G09990090Courtesy of MERCEDES-BENZ USA
REPAIR MATERIALS

Number Designation Order number
BR00.45-Z-1005-06A Paste, hot lubrication 1 kg, DB supply specification 6879.20 A 000 989 76 51