078133551D 0280155823 Audi A4 A6 2.4 2.8 V6 Injector – OEM Used & Tested

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This Audi petrol fuel injector is a genuine OEM electromagnetic fuel metering component for 2.4 and 2.8 liter V6 petrol engines used in the Audi A4 and A6. Primary OEM number 078133551D, with the secondary Bosch code 0280155823 also listed for this 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 deliver the exact amount of fuel each of the six cylinders needs at every load and engine speed, with a stable spray pattern and a quick, repeatable opening and closing response on every cycle. A properly working injector supports smooth idle, even power delivery, stable fuel trims, reasonable fuel economy and correct operation of the fuel system and emissions control as a whole.

Common signs of a faulty unit include misfires on one cylinder, rough or uneven idle, hard starting, hesitation under acceleration, higher fuel consumption, a raw fuel smell and lean or rich mixture fault codes on one bank. When an injector leaks, clogs or sticks, the engine may run unevenly, lose power, overheat a cylinder 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 078133551D 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.