Diagnosing Check Engine Light Problems

Diagnosing Check Engine Light ProblemsFew things related to your automobile can be as disheartening as the check engine light coming on. While many people fear the worst as soon as this light comes on it may actually be only a small problem. However, that little issue will grow worse if it is not addressed so be sure to get to the repair shop right away. In this list of common check engine problems we start with a worst case scenario.

Catalytic Converter

The catalytic converter is designed to convert hazardous exhaust fumes into less harmful emissions. It will almost never become damaged unless some other part or sensor fails first, which would cause excessive amounts of unburned fuel to travel through it. If the check engine light diagnostics reveal a faulty converter it is likely the light has been on for some time and now you're in for one of the most expensive types of auto repair.

Oxygen Sensor

The oxygen sensor is one of the things that can cause a catalytic converter to go bad. This sensor is located in the exhaust system and monitors how much O2 is in the exhaust in order to help dictate how much fuel is sent to the combustion chamber. If it fails or if there is an exhaust leak it will read excessive oxygen, thus sending more and more gas to the engine.

MAF Sensor

On the other end of the car is the mass airflow sensor, which measure the amounts of incoming air and calculates how much should be mixed with the gasoline. A failed MAF sensor can also cause the car to run rich, thus lowering your MPGs and damaging other parts.


Misfiring, which results in lowered fuel efficiency and a rough running engine, is usually caused by dirty or corroded spark plugs or spark plug wires, or possibly because of failing ignition coils, as well as other minor issues. Most misfiring problems can be repaired quickly and inexpensively.

Broken or Loose Gas Cap

Your best case scenario is if you simply forgot to tighten the gas cap after filling up. A loose, ill-fitting or broken gas cap can result in fuel evaporating out of the filler hose, which will be detected by vehicle sensors, thus triggering the check engine light.

When the check engine light comes on don't hesitate to get to the shop for service. For accurate check engine light diagnostics in Gonzales, LA, head to All Tune and Lube. Our auto repair techs will make sure that your vehicle is operating as best it can using the latest diagnostic and service technology. To learn more or to request expert auto repair in Gonzales call (225) 590-5369 to make an appointment.

All Tune & Lube Gonzales Blog

Written and Published By MORBiZ

When to Suspect an Alternator Problem
Watch Out for these 7 Signs of Failing Brakes
What is preventing my car from firing up?
Sustain High Performance with these 6 Maintenance Tasks
FAQ: Colored Exhaust Smoke
Why does my car need fluid services?
Great Maintenance Services that can Restore Fuel Efficiency
What is a tune up and when does my car need one?
Words to Know When Buying New Tires
Does My Vehicle Need Suspension Repair?
3 Ways to Maintain a Safe Car
4 Transmission Issues You Need to Know
End of Summer Auto Maintenance
What are the symptoms of brake trouble?
5 Ways to Keep Your Car Running Great
6 Times You Definitely Need to Call the Auto Shop
What's Leaking from My Car?
Customer Reviews of All Tune and Lube Gonzales
Why Won't Your Car Start?
5 Common Signs Your Car Needs Cooling System Repair
What is General Auto Maintenance?
Common Auto Parts that Require Replacement
Is it Time for Transmission Repair?
5 Auto Maintenance Tips to Avoid Expensive Auto Repair
Small Car Problems that Cause Big Trouble
Top 5 Signs Your Car Needs Brake Repair Now
Common Reasons to Fail Emissions Testing
Is it Time for Engine Repair? 3 Signs that Say Yes!
This is why your vehicle requires routine auto maintenance
7 Auto Repair Terms You Should Know
4 Signs You Need Suspension Repair
3 Symptoms Your Car Needs Exhaust Repair
Keeping Up with Oil Changes
The Importance of Fluid Exchange Services
Does My Car Need a Wheel Alignment?
Diagnosing Check Engine Light Problems
Why is Fleet Vehicle Maintenance so Important for Business?
Does my car need A/C repair?
Have You Checked Your Brakes Lately?
When is it Time to Head to the Auto Repair Shop?
4 Common Causes of a Dead Battery
4 Characteristics of a Quality Auto Repair Shop
Terms to Know When Buying New Tires
My Car is Shifting Funny, is it Time for Transmission Repair?
Top Signs of Radiator Failure
Excessive Exhaust: It's Time for Engine Repair
How Important is Tire Pressure?
Common Signs of it's Time for Engine Repair
5 Tips for Finding an Expert Auto Repair Shop
Why is the Check Engine Light On?
Does this mean I need auto repair?
Great Auto Maintenance Tips to Increase MPGs
3 Must Know Signs of an Exhaust Leak
If this happens you need brake repair now!
Looking for quality auto repair in Gonzales? Be sure you choose a shop with these qualities!
What Exactly is Preventative Auto Maintenance?
No Gas: Common Problems of the Fuel Delivery System
What is a Tune Up?
The Benefits of using OEM Parts for Auto Repair
3 Big Signs you Need Axle Repair
Why Won't My Car Start?
Does My Vehicle Need a Fluid Flush?
Does My Car Need Suspension Repair
3 Car Problems that Make Weird Noises
4 Signs it's Time for Cooling System Repair
3 Common Signs of Power Steering Failure
Odd Vibrations: What Needs to be Repaired
5 Serious Signs of Transmission Failure
Car Won't Start? 5 Common Auto Electrical Problems
End of Summer Maintenance that Saves You Gas
What is Leaking from my Car?
4 Signs You Need Brake Repair
3 Signs it's time to Rebuild or Replace the Engine
5 Reasons Why Regular Oil Changes are Important
5 Benefits of Tire Rotation & Replacement
4 Key Things to Look for When Looking for a Trustworthy Auto Repair Facility
How Auto Maintenance Service Saves You Money