<h1>2009 Audi S4 Keyless Entry Remote Fob (Smart Key)</h1> <p><font size="3"><b>Important Notice:</b> The 2009 Audi S4 does not support onboard programming for its smart key remote fobs. Programming must be completed using specialized diagnostic tools by a trained automotive technician. </font></p> <p><font size="3"><b>Programming Procedure:</b> </font></p> <ul> <li><font size="3">Step 1: Confirm that the vehicle is turned off and all doors are fully closed. </font></li> <li><font size="3">Step 2: A technician will connect a compatible diagnostic device to the vehicle’s onboard diagnostic port (OBD-II) to access the security system. </font></li> <li><font size="3">Step 3: The new smart key fob will be programmed into the vehicle’s electronic control unit (ECU) using secure access methods approved for Audi vehicles. </font></li> <li><font size="3">Step 4: Once programming is completed, all smart key functions should be tested, including door lock/unlock, trunk access, and ignition or push-start operation if equipped.</font></li> </ul> <p><font size="3"><b> Additional Considerations:</b> </font></p> <p><font size="3">A newly cut key blade is required if your remote includes a mechanical key. All remotes, including those already programmed, must be present during the procedure to retain functionality. Lost or unrecognized remotes will be erased from the system during this process for security.</font></p>
