Having the check engine light come on is one of the most frightening things that can happen to a driver. When that light illuminates, you might assume that an expensive trip to the mechanic is in your future, but it is important to know the possible causes. Here are the most common causes of a check engine light on your car.
Fouled Spark Plugs
If you are lucky, the problem is as simple as a fouled spark plug, and replacing that faulty plug will be all that is needed to keep your car on the road. You may not be able to fix everything on your own, but you should be able to remove and check the spark plugs even if you have no mechanical ability at all.
Faulty Spark Plug Wires
The wires that connect to the spark plugs can also cause the check engine light to illuminate. Over time those spark plug wires can become worn, and when they misfire, it can trigger the check engine light. If you want to fix everything yourself, you may be able to check the wires for wear and replace them if they appear worn.
Contaminants in the Fuel
If you pull away from the gas station and your check engine light comes on, the problem could be contaminants in the fuel. From water and excess moisture to dirt and debris, these contaminants can foul the gas tank and cause your engine to misfire. If you suspect fuel contamination, head back to the station right away to report the problem and protect your rights.
Problems with the Catalytic Converter
The catalytic converter helps your engine operate more cleanly, but it can also cause your check engine light to come on. If your catalytic converter is not working the way it should, your emission control system will turn the check engine light on to let you know.
A Bad Oxygen Sensor
There is an oxygen sensor inside your vehicle that helps regulate that vital gas flow. If the oxygen sensor is not working the way it should, you will see the check engine light come on. The complexity of replacing a failed oxygen sensor will vary according to make or model, but if you are mechanically inclined, you may be able to fix it on your own.
It is easy to panic when you see your check engine light come on, but the problem may not be as serious or expensive as you fear. A number of things can cause the check engine light to come on, and working through the possibilities one by one is the best way to set things right.