Two problems related to o2 sensor have been reported for the 2010 Ford Fusion. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Ford Fusion based on all problems reported for the 2010 Fusion.
In motion on highway with cruise control car dashboard shows �stop safely now� loose acceleration. Turn car off then back on and can drive. Check engine light on. Told vacuum pump creating issue. Replaced and car okay. While in motion on highway during acceleration �stop safely now� entire car shuts down while driving. Loss of brakes, steering, acceleration. Get car towed back to shop and told acid leak degraded wire harness. But also told they can't ensure the car will be fixed from repairing. How does a battery leak so bad without any cracks. No shop can confirm the acid leak is causing the brake issue. Possible abs module, electronic control, O2 sensor replacement too.
We had driven to a football game, when we returned to the car it would not start. All the lights worked, it turned over perfectly every time, but it would not start. Had it towed to the mechanic in the morning and it started for them. However, after multiple test they were able to get it to stop starting. Checked the codes and it said O2 sensor. Replaced O2 sensor. Car died on my way home from the mechanic while pulling out onto the highway from a stop sign where vehicles are traveling 60mph with my two small children in the car. Terrifying! I barely chugged across the lanes and got the nose of my car on the shoulder. I turned the car off and after a few tries it restarted. When I got home, I took the battery cables off the battery for the weekend as I read that could help the faulty computer issue. So far, I have not experienced this issue again. A couple of weeks before this, I noticed that at speeds of 50 mph the car felt like it was speeding up and slowing down really fast like pulsing.