Well, I have same problem too. I think it faulty code, I'll keep driving till it die. Do this 1st..unplug NEG batt cable for 30 second. Then drive around and see if CEL comes on. Like I said, I have the same problem over a year already, everytime it come on, I reset it, I have the ODB2 code reader, so it take me few second to do the job. No need to run on to AZ all da time Good luck.