BMW X5: Emissions Management
BMW X5 (G05) 2019-2026 Service & Repair Manual / Engine Service Information / 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" catalysts already in use from the N52.
The N51 engine, however, is a SULEV II compliant engine which meets the 2007 requirements. In addition to the 5 existing SULEV states of California, New York, Maine, Massachusetts, and Vermont - four states have been added for 2007. These states include, Connecticut, Rhode Island, Oregon and Washington State.
The N51 emissions measures include:
- Secondary Air System with mini-HFM
- Radiator with "Prem-air" coating
- Lower compression ratio (10:1) via modified combustion chamber and pistons
- Underbody catalyst in addition to "near engine" catalyst
- Activated carbon air filter in air filter housing
- Steel fuel lines with threaded fittings and sealed fuel tank
- Crankcase ventilation system integrated into cylinder head cover
- Purge system piping made from optimized plastic
NOTE: The SULEV II information above is only preliminary and is accurate as of 8/06.
Additional information will be released as it becomes available.
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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
SEE MORE:
Smooth Running Measurement
The DISplus/GT-1 are helpful in pinpointing the cause of an engine misfire.
Once the short test is completed,
the fault memory of the ECM can be read out to determine which cylinder or
cylinders have set misfire faults.
There may or may not be any faults present. The engine could be running rough
Cross Member
Minimum set: Mechanical tools
Note: To hold the engine when removing and installing the front axle support,
the oil sump and the transmission
Engine: M10, M20, M20B25, M20B27, M21, M30, M30B34, M30Tur, M40, M41, M42,
M43, M43TU, M44,
M47, M47T2, M47TU, M50, M51, M52, M52TU, M54, M56, M57, M57D25,
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