Yes you should fight this by hiring an attorney to handle everything for you.
Mr. Driessen is a former Deputy DA in Orange County with over 8 years of criminal law experience. Nothing stated on this site shall in anyway be construed as legal advice, or as creating any attorney client relationship. If you would like to hire Mr. Driessen, feel free to contact him at www.theocduiguy.com.
Yes, you could benefit from legal assistance. But I'm curious - what is your defense? Are you going on a standard red-light-cameras-are-bogus defense? That most certainly needs an attorney's help. If you can do this without your passenger as a witness, who is going to know he was in the car?
It's unlikely that the passenger's identity would become much of an issue in the case, and equally unlikely that the terms of your felony probation would come into play as well. Good luck.