What might cause my 2010 Ford Ranger check engine light to come on?

You're driving Your 2010 Ford Ranger down the road, when You suddenly notice the check engine light is illuminating on Your dashboard. You know that this usually means it is time for routine maintenance on Your vehicle, such as inspections for oil levels, cabin air and fuel filters, and tire rotations. In the case of the elusive check engine light, however, You could have many potential issues. The primary cause is just a loose fuel cap. If that isn't the problem, it is likely an oxygen sensor which has gone faulty, or damage or disconnection of the spark plugs. If the o2 sensor needs to be replaced, it will cost You between $40 and $85 for a new one. If You need to have the spark plugs replaced, it will cost between $8 and $24, on average.