Why is my check engine light on?

September 25th, 2019 by

It’s a terrible, sinking feeling when your check engine light comes on – how much is THIS going to cost you? That little amber light can cause a huge amount of anxiety, but before you start panicking, you should try to figure out WHY the light is on. Toyota of Orlando is here to give you some pointers straight from our auto service techs. Check them out below!

Toyota of Orlando auto service

5 reasons you may see your check engine light come on

1) Your gas cap isn’t tightened all the way. 

This is the simplest (and cheapest!) reason that your check engine light may illuminate in the dash. When the gas cap is loose, your fuel tank loses much-needed pressure AND gas fumes can be released into the atmosphere. If the cap isn’t screwed in all the way, the light will come on to warn you. Before you do anything else, try tightening the cap to see if the light turns off.

2) You have a bad O2 sensor. 

If you have a bad O2 sensor, you’ll also notice that in addition to the check engine light being on, your fuel economy isn’t what it should be. This is because the O2 sensor actually measures the unburned oxygen in your fuel system and helps to regulate it. When it goes bad, your car won’t get the right fuel efficiency AND you run the risk of doing damage to your spark plugs and catalytic converter. Schedule Orlando auto service to get things back on track.

3) You have faulty spark plugs. 

Your spark plugs actually ignite the fuel inside your engine to get your car up and running. If your dash light comes on and you notice signs like reduced fuel efficiency, your car stalling out or refusing to start, or any other performance issues, it’s time to schedule Orlando Toyota service. Ignoring bad spark plugs can result in damage to your catalytic converter, which can be expensive to replace.

4) Your mass airflow sensor needs to be replaced. 

The mass airflow sensor measures the amount of air being pulled into the engine to figure out the correct fuel/air mixture to get things up and running for your vehicle. You’ll see your check engine light come on but also notice reduced fuel efficiency and poor performance from your vehicle. Get this important part fixed immediately because if you don’t, you can do costly damage to your O2 sensors, catalytic converter, and spark plugs.

5) Your catalytic converter has gone bad. 

If you have a bad catalytic converter, you’ll find that your car not only has reduced fuel economy and performance but also tends to run hotter than normal. The catalytic converter is essential because it converts harmful carbon monoxide to carbon dioxide. Schedule repairs for this part ASAP if it goes bad!

Let Toyota of Orlando get you back out on the road

Still not sure why your check engine light is on? Let our techs check things out for you – we’re open seven days a week at 3575 Vineland Road, just off I-4 near the Millenia Mall. Call to schedule an appointment ahead of time at (407) 298-0001!

Posted in Toyota Service