NHTSA Complaint #11654165 — 2015 FORD FUSION

The engine (1.5L EcoBoost) has suffered a failure due to coolant intrusion into cylinder 3, which has led to repeated engine misfires. Trouble codes P0303 (misfire cylinder 3) and P0316 (misfire on startup) were found. The vehicle is currently available for inspection, and a diagnosis was performed by two Ford-certified mechanics using a borescope, confirming the presence of coolant in the combustion chamber. The misfires cause rough running, hesitation, and potential stalling, especially during startup and acceleration. This creates dangerous situations in traffic, such as loss of power while merging or crossing intersections, increasing the risk of a collision. Both technicians concluded the engine has coolant intrusion and recommended a short block replacement as the only viable fix. I was quoted approximately $10,000 for the repair. The vehicle has been inspected by the manufacturer (Ford), but despite acknowledging this is a known issue with the 1.5L EcoBoost engine in various Ford models, they are unwilling to assist with covering the cost of the repair in my case. The Check Engine Light initially came on intermittently and then became constant. Symptoms such as engine misfires, rough idling, and hard starts appeared around the same time, several weeks ago, and have progressively worsened since.