I recently purchased a used 2004 Nissan Sentra 1.8 S and I have came across a couple of articles that said that keyless entry in standard on it. When I purchased it from the dealership they said that they did not have a set for it. Is there a way of verifying if there is a keyless entry option on my car? Can I just open the hood and see something that can tell me? Not sure if it matters but the car was a previous rental. Thanks for any help!