I purchased a 2011 Fusion SE with 109K miles a couple of months ago for my daughter to drive. There have been two occasions when the check engine light came on, both while she was driving on the highway. She said there was no "hiccup", loss of power, or anything otherwise noticeable and that the car continued to drive fine in both instances. Using FORScan and Car Scanner ELM OBD2 I have been able to see the errors and clear them.
The first time they were:
P0300 - Random Misfire Detected
P0304 - Cylinder 4 Misfire Detected
The second time they were:
P0300 - Random Misfire Detected
P0301 - Cylinder 1 Misfire Detected
There was about 5 weeks and 1,500 miles of city driving in between during which everything was fine.
My initial thoughts are the spark plugs and/or ignition coils. Both are relatively easy and inexpensive to replace. But before I start chasing the problem and replacing parts, I wanted to see what folks with more experience would recommend.
The first time they were:
P0300 - Random Misfire Detected
P0304 - Cylinder 4 Misfire Detected
The second time they were:
P0300 - Random Misfire Detected
P0301 - Cylinder 1 Misfire Detected
There was about 5 weeks and 1,500 miles of city driving in between during which everything was fine.
My initial thoughts are the spark plugs and/or ignition coils. Both are relatively easy and inexpensive to replace. But before I start chasing the problem and replacing parts, I wanted to see what folks with more experience would recommend.