11 78 510 Replacing Both Oxygen Control Sensors (S54)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required:

11 7 030
11 9 150

Read out fault memory, clear if necessary. Refer to 13 00 002 CHECKING FUNCTION OF DIGITAL ENGINE ELECTRONICS (DME) .

E46 Only:

Remove microfilter.

Open cable duct on lower section of microfilter housing (2) and feed out cable.

Release screws (1) and remove lower section of microfilter housing (2).

Fig 1: Identifying Lower Section Of Microfilter Housing

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E46 Only:

Lever out expansion rivets. Remove air duct (1).

Fig 2: Locating Air Duct

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Remove hose (1) for engine vent.

Remove sealing cap (2).

Remove ignition coil cover.

Fig 3: View Of Engine Vent Hose And Sealing Cap

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NOTE: The plug housings of the oxygen sensors for cylinders 1 to 3 and 4 to 6 are different.

Unclip plug housing (1) from mounting.

Disconnect plug connections of oxygen sensors.

Fig 4: Unclipping Plug Housing From Mounting

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Feed oxygen sensor cables out of shield plate of exhaust manifold.

Installation:

Clip cables of oxygen sensors into mounts on shield plate of exhaust manifold.

Fig 5: View Of Oxygen Sensor Cables In Mounts

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CAUTION: Ensure cables are exactly routed.

NOTE: Fig. shows US version.

Remove underbody protection.

E46 Only:

Remove reinforcement plate.

CAUTION: The article 51 71 374 REMOVING AND INSTALLING / REPLACING REINFORCEMENT PLATE ON FRONT AXLE SUPPORT (M3) contains important installation instructions.

The oxygen sensors for cylinders 1 to 3 and 4 to 6 are different.

Mark oxygen sensors so as not to mix sensors up at a later J stage.

Detach oxygen sensors with special tool 11 7 030 in conjunction with special tool 11 9 150.

Remove oxygen sensor from cylinders 1 to 3.
Remove oxygen sensor from cylinders 4 to 6.

Fig 6: Removing Oxygen Sensors
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Installation:

The threads of new oxygen monitor sensors are already coated with Never Seez Compound.

If an oxygen monitor sensor is used again, apply a thin and even coat of Never Seez Compound to the thread only.

Do not clean that part of the oxygen sensor which projects into the exhaust system branch and do not allow it to come into contact with lubricants.

Installation:

When special tool 11 9 150 is used in conjunction with special tool 11 7 030, 47 N.m on the dial on the torque wrench corresponds to an actual tightening torque of 50 N.m.

For final tightening of oxygen sensors, fit torque wrench and special tool (11 7 030/11 9 150) as illustrated.

Tightening torque, refer to 11 78 1AZ in ENGINE - TIGHTENING TORQUES .

Install oxygen sensor for cylinders 4 to 6 and tighten down.
Install oxygen sensor for cylinders 1 to 3 and tighten down.

Cover oxygen sensors when applying underseal.

Pay attention to cable routing for oxygen sensors.

Fig 7: Installing Oxygen Sensor

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