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Engine start stop button: Compatibility for compatible with Audi A4 A5 Q5 B8 models from 2008 to 2017 using the 4 pin connector, aligning with the factory push start location for a secure, accurate dashboard fit. OE 8K0905217A 8K0905217: Designed to match the 4 pin plug and wiring, enabling a straightforward swap of the factory push start module, reusing the existing harness and trim for an efficient, tidy installation process. Push start switch 4 pin: Controls engine start and stop by a single press, clear legend marking, stable electrical contact, and responsive action that works with the vehicle keyless entry and ignition system. Ignition start stop switch uses: Replaces a worn or sticking button to restore consistent starting, supporting daily driving across city commutes, school drops, errands, and longer highway trips through varied seasons. Car interior replacement: Suitable for home garage DIY or professional workshops, compact form fits the center console opening and can be accessed with basic trim tools following standard safe service procedures.