06B133551K 1166A00477 Audi A4 A6 1.8T Fuel Injector – OEM Used & Tested

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This Audi petrol fuel injector is a genuine OEM electromagnetic fuel metering component for turbocharged 1.8T engines used in the Audi A4 and A6. Primary OEM number 06B133551K, with the secondary reference code 1166A00477 also marked on the unit. 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.

Its job is to supply the exact quantity of fuel the turbocharged engine needs at every load and speed, with a stable spray pattern and a quick, repeatable opening and closing response on every cycle. A properly working injector supports smooth idle, strong and even boost response, stable fuel trims, sensible fuel economy and correct operation of the fuel system and emissions control as a whole.

Common signs of a faulty unit include misfires under load, rough or shaky idle, long cranking, hesitation when the turbo spools up, higher fuel consumption, a fuel smell and lean or rich mixture codes. When an injector leaks, clogs or sticks, the engine may run unevenly, lose power, run lean under boost or damage the catalytic converter and shorten engine life over time.

This is a used original part, removed from a vehicle and tested before sale. Match the exact OEM number 06B133551K before ordering. Professional installation is recommended, and a fuel pressure check, new seals and O-rings, injector balance test and scan tool diagnosis are advised where applicable.