Special tools required:

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

117 020

Read out fault memory, clear if necessary. Refer to SELF-DIAGNOSTICS .

NOTE: The plug connection must be disconnected before the oxygen control sensor is removed.

If the plug connection separation point is below the cover for the fuel injectors:

If necessary, remove lower section of microfilter housing. Remove cover from fuel injectors.

Unclip oxygen control sensor cable from retainer. Disconnect plug connection for oxygen control sensor.

Release oxygen control sensor with special tool 117 020.

Fig 1: Unclipping Oxygen Control Sensor Cable From Retainer

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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

If an oxygen sensor is used again, apply a thin and even coat of Never Seez Compound (refer to BMW Parts Service) to the thread only.

Part of oxygen control sensor which projects into exhaust system branch must not be cleaned or come into contact with lubricant.

Installation:

Secure oxygen control sensor with special tool 11 7 020.

Tightening torque. Refer to ENGINE - TIGHTENING TORQUES .

Pay attention to cable routing of oxygen control sensor.

Fig 2: Securing Oxygen Control Sensor With Special Tool 11 7 020

Courtesy of BMW OF NORTH AMERICA, INC.