A vehicle with a remote starter can start with the RS remote but requires what additional component for functionality?

For a remote starter to function properly in a vehicle, it often requires a component to authenticate the signal sent by the remote. In this case, the factory key needs to be held near the key cylinder to provide this authentication. This is commonly used in vehicles with a transponder key system, where the remote starter must communicate with the vehicle's security system.

The transponder chip in the factory key sends a unique signal to the vehicle’s immobilizer system to confirm that the key is legitimate, allowing the vehicle to start remotely. This is a safety feature to prevent unauthorized starting of the vehicle.

The other components mentioned, such as having the vehicle's battery charged, while important for the overall operation of the remote starter, do not specifically address the authentication required for starting the vehicle remotely. Similarly, a key fob replacement or checking engine oil levels does not impact the remote starting ability directly. Therefore, having the factory key close by is essential for the remote starter functionality.