1439800 BMW M54 E46 E39 X3 X5 Petrol Fuel Injector – OEM Used & Tested

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This BMW petrol fuel injector is a genuine OEM electromagnetic fuel metering component for BMW M54 six-cylinder engines found in the E46 3 Series, E39 5 Series, X3 and X5. Primary OEM number 1439800. It is designed to open and close on command from the engine control unit, delivering a precise, finely atomized spray of fuel into the intake port so that fuel and air mix evenly before combustion takes place in the cylinder.

Its job is to supply exactly the amount of fuel the engine needs at every load and speed, with a consistent spray pattern and a fast, repeatable opening and closing response on every cycle. A properly working injector supports smooth idle, crisp throttle response, stable fuel trims, good fuel economy and correct operation of the whole fuel system, including clean combustion and emissions control.

Common signs of a faulty unit include misfires on a single cylinder, rough or unstable idle, hard starting, hesitation under acceleration, higher fuel consumption, a raw fuel smell and lean or rich mixture fault codes. When an injector leaks, clogs or sticks, the engine may run unevenly, lose power, overheat a cylinder or slowly damage the catalytic converter over time.

This is a used original part, removed from a vehicle and tested before sale. Match the exact OEM number 1439800 before ordering. Professional installation is recommended, and a fuel pressure check, injector balance test, new seals and O-rings and a scan tool diagnosis are advised where applicable.