We were on the interstate and had a check engine light come on. I spoke to Warren on the telephone and the gentleman was very helpful in helping me determine if it was serious or not (it was not serious because, as he pointed out, the light was not flashing). He was so helpful that I wanted him to do further diagnostics. When we got to the shop, he worked us in immediately and determined that it was, indeed, not serious and we could continue with our travels. I was thoroughly impressed with the attention we got and the advice. And we were not charged for the diagnostics. I unconditionally recommend Warren Automotive. My only regret is that we do not live near them and we cannot use them for all of our automotive services.