It's a 300 Cat, and yes I was kind of wondering why the computer check was not done but was under the impression it was. But after telling them about the different lights comeing on it supprized me that they did not check, so if anyone is in the Kingman, Az area would not advise stopping at Great West unless you spell out your problem then the might assit further. We did stop again in Ogdan, UT and went to Ogden Diesel and he did put it on the computerand found some thing out and hopefully now everything will be ok. I highly reccomand Ogden Diesel they are right off I-15, exit 343. A very good bunch of people who will realy work to help fix your problem.