I had my 2009 Dodge serviced at the service department at AutoNation Chrysler North Phoenix on I17 and Bell Rd due to a recall notice for a faulty timing chain and timing chain cover. I picked my car up when service was finished and before I arrived at my house less than 2 miles away the check engine light illuminated. With the major work entailed in replacing the timing chain and cover it is no coincidence that the check engine light came on before arriving home, someone messed up. I returned the car back to the service department and requested that the check engine light be investigated and repaired. A different service manager than the one I had dealt with before called to tell me that the check engine light is not related to the recall service as it is emissions related and that it would cost $420 to repair. I requested that they prepare my car for me to pick up so that I can get a second opinion. Before leaving with my car I requested a quote which they were hesitant to provide. I insisted that if they are recommending repair that they should be willing to back it up with a hard copy quote. They provided me with a discharge paper and hand wrote that the repair would cost $250 which is curious because I was quoted $420 on the phone. After leaving the dealership I purchased a diagnostic device which confirmed that the check engine light is emissions related and I simply reset the indicator and the light has never come back on again. It certainly appears to me that the dealership could have taken simple trouble shooting steps to remedy the issue rather than quoting me an unnecessary charge. Further, considering all these circumstances, it appears that the service department intentionally caused the check engine light to illuminate prompting my return to afford themselves the opportunity to quote me for an unnecessary charge. Either way you slice it the service department at this dealership demonstrated incompetence or malicious intent that would have unnecessarily costed me $420. I recommend that any consumer that values integrity and honesty stay clear of AutoNation dealerships as these circumstances reflect poorly on the entire chain.