Why is the check engine light on?

It is one of those things you never want to see, but more than likely, it's going to happen to you if you drive regularly. The check engine light may cause you to feel your stomach drop upon first seeing it turn on, but you shouldn't be worried. Chances are there is just some small problem that has arisen that needs to be taken care of. However, if you don't get the issue resolved soon it will grow worse. This could result in a need for extensive and expensive repair. As soon as the check engine light comes on head to your local auto repair shop for proper diagnostics.

Loose gas cap

In the best case scenario the check engine light popped on to let you know that you forgot to tighten the gas cap after filling up. If the gas cap is loose, cracked or otherwise broken it may allow fuel vapors to evaporate out of the gas tank. This would be caught by the EVAP system, thus triggering the light.

Transmission problems

It is important to note that the check engine light doesn't turn on just for engine related problems. Things such as transmission trouble will also turn the light on. The most common transmission issue that will trigger the light is low transmission fluid levels.

Faulty MAF Sensor

The mass airflow sensor detects incoming air and calculates how much of it needs to be mixed with the gasoline in order to create a properly running engine. If the sensor malfunctions it can greatly reduce your fuel efficiency and the overall performance of the vehicle.

Bad O2 sensor

On the other end of the car is the oxygen sensor, which monitors the amount of oxygen in the exhaust in order to also help calculate the proper air/fuel mix. A malfunctioning O2 sensor could also cause poor fuel efficiency, and may lead to trouble with the catalytic converter if not quickly fixed.

Failed catalytic converter

The catalytic converter is one of the most expensive parts to replace on a car. It converts hazardous exhaust fumes into less harmful emissions. However, it will not break unless there is some other trouble, trouble that would have likely caused the light to turn on first. This is why it is important to always get to the repair shop for check engine light diagnostics as soon as it turns on.

For check engine light diagnostics in Covina visit Hye Tech Automotive. Our auto repair technicians will scan your car's error codes and get the issues resolved as soon as possible. Give us a call at (626) 332-5452 to request expert auto repair in Covina or the surrounding area today.

Hye Tech Auto Blog

Written & Published By MORBiZ

Symptoms of Alternator Failure We Can Fix at Our Covina, CA Auto Shop
Recent Customer Reviews for Hye-Tech Auto in Covina, CA
Signs of Engine Trouble We Can Fix at Our Covina, CA Auto Shop
3 Maintenance Measures to Prevent Massive Engine Problems
Symptoms of Cooling System Failure We Can Fix at Our Covina, CA Auto Shop
Common Signs of Brake Failure We Can Fix at Our Covina, CA Auto Shop
Basic Ways to Prevent Major Engine Problems
Common Causes of No-Start that We Can Repair at Our Covina, CA Auto Shop
What can I do to keep my brakes healthy?
Warning Signs of Transmission Trouble that We Can Fix at Our Covina, CA Auto Shop
Why You Should Always Stay Current with Oil Changes
Warning Signs of Suspension Failure We Can Fix at our Covina, CA Auto Shop
What are simple ways to prevent fuel waste while driving?
Visit our Covina Auto Shop when You Notice One of these Signs of Alternator Trouble
What are the main systems in an automobile?
Common Symptoms of an Engine Problem
What are common signs of cooling system trouble?
What are symptoms of brake trouble?
Auto Maintenance before Going on a Road Trip
What caused my check engine light to turn on?
What are common types of car trouble that cause no-start?
Bad Driving Habits that Cause Transmission Problems
Why is it important to keep up with oil changes?
7 Signs that You Need Suspension Repair
8 Ways to Boost MPGs
7 Symptoms of a Transmission Issue
7 Symptoms of an Alternator Issue
How to Increase Engine Life
When to Get a Transmission Fluid Flush
Expert Brake Repair in Covina, CA
Stay Current with these 6 Types of Auto Maintenance
6 Reasons a Check Engine Light Will Illuminate
6 Issues that Can Prevent Your Car from Starting
Expert Auto Repair in Covina, CA
6 Signs of Suspension Failure
6 Signs of Engine Trouble that Mean You Should Get to the Shop
7 Simple Ways to Increase Gas Mileage
Don't Fall Behind on these 6 Fluid Flushes!
Transmission Trouble: 6 Classic Signs
How to Tell if Your Alternator Is Failing
What are the signs of cooling system trouble?
Top Tips for Preparing a Car for a Road Trip
Common Signs of Brake Trouble
Customer Reviews of Hye Tech Auto in Covina
4 Common Reasons the Check Engine Light will Come On
Why Won't My Car Start?
Why are my MPGs Lower?
Identifying Automotive Fluid Leaks
Is it Time for an Engine Rebuild?
Common Symptoms of General Car Trouble
Understanding Your Car's Computers & Sensors
If this Happens, Schedule Engine Repair Now!
3 Signs of a Failed Axle
5 Must Know Signs Your Car Needs Transmission Repair Now
5 Easy Ways to Increase Your Fuel-Efficiency
Does My Car Need Steering Repair?
Scheduled Auto Maintenance You Should Never Skip
Does Your Car Need Auto Electric Repair?
What is Scheduled Auto Maintenance?
Does My Car Need Radiator Repair?
3 Signs it is Time for Clutch Repair
5 Common No Start Problems
Why is the check engine light on?
This Means it is Time for Brake Repair Now
Is it Time for a Tune Up?
Common Signs of Upcoming Engine Failure
Getting a Buyer's Inspection Before Purchasing a Used Car
How do I know if my Car Needs Suspension Repair?
Does My Car Need Transmission Repair? Here's How to Tell
Why Do I Need To Change My Car's Oil?
What Free Auto Services Does Hye Tech Auto Offer
Simple Auto Maintenance for Increased MPGs
5 Types of Signs that Mean it is Time for Auto Repair
Why is Regular Auto Maintenance so Important?
What do these noises mean?
5 Common Symptoms of Cooling System Trouble
Why is the check engine light on?
Excessive Exhaust - What Does it Mean?
5 Symptoms of Brake Failure that You Need to Know
4 Signs You Need a New Starter
Common Issues Requiring Auto Electric Repair
Vehicle Vibes: 4 vibrations that mean your car needs auto repair
How to Find a Great Auto Repair Shop in Covina
3 Signs it's Time for a Wheel Alignment
These 4 Problems Mean it is Time for Engine Repair
What is Routine Auto Maintenance
Why Won't My Car Start?
Warning Signs of a Cracked Engine Block
Strange Vibrations that Indicator Vehicle Problems
Why are Oil Changes so Important?
3 Important Services to Keep your Car Safe
Common Signs of Alternator Trouble
5 Must Know Symptoms of Transmission Trouble
3 Do-It-Yourself Auto Maintenance Tips
Does Your Car Need Radiator Repair?
Why Does My Car Smell Weird? 5 Smells that Mean it is Time for a Repair
Does My Car Need a Fluid Flush?
4 Signs you need Engine Repair
What Does the Suspension Do and Why Should I Repair It?
3 Signs of an Exhaust Leak
4 Tips for Better Gas Mileage this Summer
Three Signs Your Clutch is Wearing Out
What is a Transmission Flush?
Belt & Hose Inspection - How to Check for Damage
How to Know Your Brakes Need Service or Repair
How to Check Your Tire Pressure
Check Engine Light Five Common Causes