Description
The part number A451 545 02 09 28 is listed as an OEM repair kit for the light/stop‑light switch used in Smart and Mercedes vehicles.
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One listing describes it as: “Repair Kit, Light Switch – Smart (451545020928) … Genuine OEM part manufactured specifically to fit Smart (models 2008‑2019)”. MB Parts
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Another listing shows this part number “A451545020928” under the description “Smart Genuine Brake Light Switch Kit with Cover Fortwo 450/451” and lists the weight at ~175 g. eBay UK
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The kit likely includes the electrical switch (brake light switch), mounting cover/housing, and possibly associated hardware for replacement. It is designed to restore correct operation of the light switch (e.g., brake light, tail lights) when the original switch is faulty.
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It is important for safety since a non‑functioning light switch may cause brake lights or other lights not to operate properly, affecting visibility and compliance with vehicle safety regulations.
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When installing, ensure the correct part number and compatibility with your vehicle’s model, year and chassis (Smart Fortwo, ForFour, etc) as indicated.

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