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Remove/install heated O2 sensor - AR07.52-P-5303GZP

ENGINE 272, 273 in MODEL 164, 251 

Fig 1: Identifying Heated O2 Sensor Remove/Install Components
G10119824Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
DANGER Risk of death  caused by vehicle slipping or toppling off 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
DANGER Risk of injury  to skin and eyes caused by handling hot or glowing objects. Wear safety gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
1 Turn key in ignition lock to position "0" IMPORTANT Vehicles with Keyless Go, code 889:
Press Keyless Go start/stop button repeatedly until ignition is switched off.
 
2 Remove left catalytic converter IMPORTANT Only required if O2 sensors on the left side should be removed.
INSTALLATION IMPORTANT Ensure correct routing of lines on O2 sensors.
AR49.10-P-7100GZA
3 Unclip electrical connector and electrical feed line for corresponding O2 sensor out of retaining clamps on transmission    
4 Disconnect electrical connector for corresponding O2 sensor    
5 Unscrew corresponding O2 sensor out of catalytic converter completely INSTALLATION IMPORTANT Coat thread with heat-resistant lubricant.  
TORQUE SPECIFICATION *BA14.00-P-1002-01A 
SPECIAL TOOL Fig 2
Paste *BR00.45-Z-1005-06A 
6 Install in the reverse order    
7 Read out fault memory and erase if necessary IMPORTANT Stored faults which may be caused by disconnecting cables or by simulation during test operations, must be erased in the fault memory after completing the work.
STAR diagnosis system
 
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 Test run engine and check exhaust system for leaks    
O2 SENSOR

Number Designation Engine 272 Engine 273
BA14.00-P-1002-01A O2 sensor to catalytic converter Nm 50 50
Fig 2: Identifying Box Wrench Bit (000 589 71 03 00)
G07694428Courtesy 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