BMW X5 Owners & Service Manuals

BMW X5: Ignition Management

Most of the ignition system components have remained the same for all NG6 engines for 2007. There are some minor changes to the ignition coils that apply to all versions. The coils have been optimized for more durability.

Spark Plugs

The spark plugs for the N51 and N52KP remain the same as N52. However, the N54 uses a completely new spark plug from Bosch. The spark plug design consists of a 12 mm thread which contrasts from the 14 mm design on the N52 which prevents any possibility of improper installation.

The hex on the spark plug is also a 12 point design which requires a special tool. The tool (socket) has a "thinwall" design to facilitate access in the confined area of the N54 cylinder head.

Engine Service Information
Fig. 69: Identifying Spark Plugs

Spark Plug Diagnosis (N54)

Due to the proximity of the spark plug to the fuel injector nozzle, any divergence in the fuel spray may cause possible spark plug damage. This makes spark plug diagnosis an important part of N54 service concerns.

Information gained by the spark plug diagnosis may indicate possible fuel injector faults. Spark plug replacement interval has been reduced to 45,000 miles for the N54.

The Fig. 70 below can be used to assist in diagnosis:

Engine Service Information
Fig. 70: Identifying Spark Plug Wear Pattern

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 Emissions Management

The N54 and N52KP meet ULEV II requirements for 2007. There are not many changes to the emission systems on these engines. The N54 engine has 2 underbody catalysts in addition to the "near engine" c

 Performance Controls

Cooling System The cooling system of the N54 engine consists of a radiator circuit and an isolated oil cooling circuit. The fact that there is an isolated oil-cooling circuit ensures that heat is not

 Steering And Wheel Alignment

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 Depending on the equipment version: lane change with active guidance

Principle The system assists the driver when lane changes are necessary to reach a navigation destination. General information The system uses the sensors of the steering and lane control assistant. Safety information Warning The system cannot serve as a substitute for the driver's personal judgment

 Replacing Front Crankshaft Radial Seal (N52K)

Special tools required: 11 9 221 11 9 222 11 9 223 11 9 224 11 9 231 11 9 232 11 9 233 Necessary preliminary tasks: Remove vibration damper IMPORTANT: Do not release central bolt. If the central bolt is released, the sprocket wheels of the timing chain and the oil pump will no longer be

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