Your going to need an expert to testify to the lose of value. Unfortunately, getting someone qualified to testify about the value of your vehicle can be tough and expensive. The law doesn't allow you to recoup the experts fees. So you have to weigh the loss of value vs. expert fees. On most vehicles it isn't worth it. Good luck
To reiterate what Lance said, you will need an expert to provide an opinion on the diminished value. In the metroplex, there are several companies that will provide a detailed report for around $350. I suspect that there are similar services in either Lubbock or Amarillo.
In your case, with a new car, I would think it would be money well spent if you have an attorney lined up to handle the case or if you feel comfortable pursuing the matter on your own. You can file the case in small claims court if your damages are $10,000 or less. Good Luck
I think the previous responses are right on point. You need to weigh the cost of further pursuit against your likelihood of recovery. To fully investigate this, I suggest you contact someone who is an expert in this area of diminished value evaluations to determine what the cost of getting an expert involved in your case would be versus what your actual diminished value claim may be worth. I suggest you consider Googling "Texas diminished value appraisal" and you should find a number of potential appraisal options. With a good report from a trusted appraisal service, you may be able to get a better settlement.
DISCLAIMER: Please know that this answer is being provided to you in response to the limited information contained in your submission and should be considered for informational and/or educational purposes only. This response does not establish any attorney client privilege or relationship between you and me, as a responding attorney, and my post certainly does not attempt to counsel you on any of the pertinent legal facts and/or implications concerning your issue. To fully investigate and determine your legal rights, should you so choose, I recommend that you promptly consult with an attorney of your choosing as time may be of the essence.
Sign up to receive a 3-part series of useful information and advice about personal injury law.