I had the codes read (I honestly forget what they were) but I was informed it pointed to AMM/O2 sensor. I also had a couple of misfire codes. I changed the spark plug connectors - short money and all of my hesitation went away. after a couple of months the CEL reappeared and like I said I was told it pointed to AMM/O2 sensor. Nobody could tell me a surefire way to verify it was the AMM but I always use the rule of thumb that if the choice is between 2 parts and the dealer sells 5 x as many of one than the other I roll the dice. Example when I called the dealer yesterday he told me he had sold 5 AMM's since Friday. I found a site where I could buy it for 50% of dealer cost ($256.00) and figure the diagnostic charges alone would be $100+ so if I am wrong I am out $150 but still have a new part that seems to fail regularly and effect dramatically how the car runs. I'll post the results in afew days once I receive it.