I am being pulled over and the officer has asked for my consent to search my car.

Do not let the officer search your car regardless of what he says. If he has a warrant or a probable cause he will not ask permission, he will just do it. If he does not, he needs your permission. That is why he is asking. Don't give it to him. Make him do the work that he is paid to do. Be polite, but be firm. Do not agree to let the officer search your car.