NHTSA Complaint #11350492 — 2016 FORD FUSION

THE CHECK ENGINE LIGHT IS ON. THE CODE WAS P0304, WHICH IS A MISFIRE IN CYLINDER 4. THE SPARK PLUGS WERE DUE FOR A CHANGE, SO I CHANGED THEM, THE OIL HAS BEEN CHANGED AT RECOMMENDED INTERVALS, AND FUEL INJECTOR CLEANER USED WHEN FILLING UP. THE NEW SPARK PLUGS DID NOT MAKE THE ENGINE LIGHT GO AWAY AFTER CLEARING THE CODE. I TESTED THE IGNITION COILS, AND THEY ARE FINE. ALSO, THE COOLANT LEVEL IS OFTEN LOW, AND I HAVE TO PUT A QUART IN A WEEK. IT IS NOT LEAKING FROM ANYWHERE. I STARTED RESEARCHING, AND FOUND THAT THERE ARE MANY OTHER FORD FUSIONS WITH THIS PROBLEM, AND THE COOLANT IS LEAKING INTO A CYLINDER, AND GIVING THE MISFIRE ON A CERTAIN CYLINDER CODE.