2008 Mercedes Benz E320FACTORY OEM SERVICE PROCEDURE

Remove, install O2 sensor - AR07.04-P-0080TI

ENGINE 642 in MODEL 211 

Fig 1: Identifying O2 Sensor Upstream Of TWC And Connector
G07248968Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
REMOVINGINSTALLING Remove/install     
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
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
DANGER Risk of death  caused by vehicle slipping or toppling off the lifting platform. Align vehicle between columns of lifting platform and position four support plates at lifting platform support points specified by vehicle manufacturer. AS00.00-Z-0010-01A
DANGER Risk of injury  caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof. Keep body parts and limbs well clear of moving parts. AS00.00-Z-0011-01A
1 Open engine hood and move to vertical position AR88.40-P-1000T
2 Remove engine trim panel IMPORTANT Only install engine cover after engine test run and leak test. AR01.10-P-2405TI
3 Remove bottom sections of soundproofing IMPORTANT Remove center and rear soundproofing bottom section. Only install soundproofing bottom section after engine test run and leak test. AR94.30-P-5300T
4 Detach connector for O2 sensor upstream TWC (G3/2x1) IMPORTANT Remove connector O2 of sensor upstream TWC (G3/2x1) from bracket.  
5 Expose electrical line of O2 sensor upstream TWC (G3/2) IMPORTANTInstallation:  Install new cable ties.  
6 Remove engine intake air duct upstream of air filter IMPORTANT Remove only on right-hand side.  
7 Remove air filter housing IMPORTANT Remove only on right-hand side. AR09.10-P-1150TI
8 Unscrew the O2 sensor upstream of TWC [KAT] (G3/2) IMPORTANTInstallation:  Coat thread of O2 sensor upstream of TWC (G3/2) with heat-resistant lubricant.  
TORQUE SPECIFICATION O2 sensor at catalytic converter *BA07.04-P-1003-01G 
Paste *BR00.45-Z-1005-06A 
9 Install in the reverse order    
INSPECT Checking     
10 Conduct engine test run and check exhaust system for leaks    
SENSORS

Number Designation Engine 642 without particle filter Engine 642 with particle filter
BA07.04-P-1003-01G O2 sensor to catalytic converter Nm 50 50
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
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.