No matter how well you treat your car, it will eventually need more than a simple oil change to keep it running. Your car is outfitted with a range of sensors to monitor your engine and keep things running smoothly. When something goes wrong that the system can’t fix on its own, the check engine light comes on to let you know there’s a problem. While some of these problems mean a trip to a full-service auto shop, others are quick fixes you can do at home. Here are five of the most common reasons your check engine light will come on and recommendations for fixing it from Schaller Jacobson Collision and Automotive Repair in La Crosse, WI.

Possible Reasons for a Check Engine Light

1. Loose Gas Cap

Yes, something this simple can set off your check engine light, which is why it’s the first thing you should look for. Your engine needs a tight seal to maintain pressure and work properly. Instead of heading straight to a full-service auto shop, tighten your gas cap and examine it for any signs of damage.

2. Damaged Spark Plugs

Your spark plugs and spark plug wires are essential to keeping your car running. If you know this is the problem, you can replace them yourself in about an hour. If you aren’t sure or don’t want to fiddle with your engine, a trip to the auto shop is in order.

3. Faulty Mass Airflow Sensor

Your mass airflow sensor (MAF) helps regulate how much fuel the engine should inject into the cylinders. When it’s not working, other engine parts can be damaged, and your fuel efficiency will decrease.

4. Damaged Catalytic Converter

This is a problem in its own right but is also usually a symptom of other damaged parts. If your catalytic converter isn’t doing its job, it’s time to visit a full-service auto shop for more thorough repairs.

5. Failing Oxygen Sensor

Unlike the MAF, which measures air coming in, the O₂ sensor measures oxygen leaving the engine without being burned. When it breaks down, you can see increased damage in other areas of the car as well as up to 40% loss of efficiency.

When your check engine light comes on, have a look under the hood. Sometimes the problem is something you can fix; otherwise, bring your car in to Schaller Jacobson Collision and Automotive Repair for car tuneup services. Call them at (608) 788-2545, or get in touch online.