Removal and Replacement
Exhaust Manifold, Front Exhaust Pipes with Catalytic Converters and Front Mufflers Overview
• Some vehicles have an additional oxygen sensor installed after the catalytic converters - item 20 -. Both sensors are actually connected but do not function.
1 Connector
• Brown, 6 pin
2 Heated Oxygen Sensor (HO2S) 2 (G108),
• 50 Nm
• Bank 2, sensor 1.
• Installed in the exhaust gas stream of cylinders 4, 5 and 6.
• Lubricate the threads only with (G 052 112 A3); do not let the (G 052 112 A3) get onto the slits of the oxygen sensor body.
• Removing and installing, refer to => [ Heated Oxygen Sensor and Heated Oxygen Sensor 2 ] Heated Oxygen Sensor and Heated Oxygen Sensor 2.
3 Nut
• M8 - 25 Nm
• M10 - 40 Nm
• Replace
4 Connector
• Black, 6 pin
5 Heated Oxygen Sensor (HO2S) (G39)
• 50 Nm
• Bank 1, sensor 1.
• Installed in the exhaust gas stream of cylinders 1, 2 and 3.
• Lubricate the threads only with (G 052 112 A3); do not let (G 052 112 A3) get onto the slits of the oxygen sensor body.
• Removing and installing, refer to => [ Heated Oxygen Sensor and Heated Oxygen Sensor 2 ] Heated Oxygen Sensor and Heated Oxygen Sensor 2.
6 Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131)
• 50 Nm
• Bank 2, sensor 2.
• Installed in the exhaust gas stream of cylinders 4, 5 and 6.
• Lubricate the threads only with (G 052 112 A3); do not let (G 052 112 A3) get onto the slits of the oxygen sensor body.
• Use ring spanner 7-piece set (3337) for removal and installation.
7 Connector
• Black, 4 pin
8 Connector
• Brown, 4 pin
9 Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130)
• 50 Nm
• Bank 1, sensor 2.
• Installed in the exhaust gas stream of cylinders 1, 2 and 3.
• Grease the thread only with (G 052 112 A3); do not let the (G 052 112 A3) get onto the slits of the oxygen sensor body.
• Use ring spanner 7-piece set (3337) for removal and installation.
10 Heat Shield
11 Intake Manifold Support
12 Bolt
• 20 Nm
13 Gasket
• Replace
14 Exhaust Manifold
• Removing and installing, refer to => [ Exhaust Manifold ] Exhaust Manifold.
15 Nut
• 25 Nm
• Replace
16 Front Muffler
17 to Middle Muffler
18 Bolt
• 25 Nm
19 Suspended Mount
• For the left and right front exhaust pipe.
20 Catalytic Converter
• Installed in exhaust stream of cylinder 1, 2 and 3 on right side as well as 4, 5 and 6 on left side.
21 Primary Catalytic Converter
• With decoupling element.
• The decoupling elements must not be bent more than 20° - otherwise they may be damaged.
• Installed in exhaust stream of cylinder 1, 2 and 3 on right side as well as 4, 5 and 6 on left side.