We picked our car up from a local dealer after having some drive train work done on it and on the way home the check engine light came on (light was not on prior to taking it in for work). We took it back to the dealer the following business day and now they are saying there are other major mechanical issues with the car based on their diagnostic testing from the engine light being on to the tune of several thousand dollars.
If the work was performed in a sub-standard manner (negligently) and caused the further mechanical issues (or dealer failed to perform the initial repairs properly), then you might have potential claims against the dealer. Best thing to do is to consult with a local consumer law attorney. Try www.naca.net if you have trouble finding someone nearby. Good luck.