BMW X5: Emissions Management
BMW X5 (G05) 2019-2025 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
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DTC Dynamic Traction
Control
Principle
Dynamic Traction Control (DTC) is a version of
the Dynamic Stability Control (DSC) where drive
power is optimized.
The system ensures maximum drive power on
unusual road conditions, for instance unplowed
snow covered roads, or loose road surfaces, but
with somewhat limited driving stabili
Oil Supply - System Functions
The oil condition sensor reports the engine oil level and engine oil quality
back to the DME control unit. A
temperature sensor in the oil condition sensor indicates the engine oil
temperature. The engine oil temperature is
used together with the coolant temperature to calculate the engine tempera
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