Check Engine Light On

Check Engine Light On?

Come in for a Diagnosis Scan

The moment you see that your check engine light is on is frustrating for most divers because that little yellow light can mean any number of things – from a loose gas cap to an engine on its last breath. If your check engine light is on, call our team of experienced mechanics diagnose the issue for you at one of our Houston area locations. With locations in Katy, Montgomery, Kingwood, and the Energy Corridor, we have a mechanic that can diagnose your check engine light near you! Our team can quickly and accurately diagnose your check engine light, provide an estimate for any necessary repairs and get you back on the road.

Car manufacturers use a variety of warnings similar to the well-known “check engine,” such as “service engine soon” or “check powertrain.” Most vehicles have an engine icon that lights up. Some just use the word “check.” Perhaps the worst part about this stressful warning may be that you are still driving, and the problem remains a mystery. It’s imperative to schedule a full diagnostic scan of the vehicle before a potentially minor fix becomes a major expense. Your vehicle’s service engine light is called a “Malfuction Indicator Lamp (MIL)” by the Texas Departmemt of Public Safety.


If your service engine or check engine light is blinking it means that one of the vehicle’s sensors detected a serious problem, and you should pull your vehicle over at your earliest opportunity to do so safely. If the engine light comes on but is not blinking, we still strongly advise you to take it to a certified auto mechanic as soon as safely possible. It could be the battery, brakes, transmission, low oil, radiator leak, electrical problem; any number of issues. Auto repair shops usually have check engine light code readers, called OBD scanners, on hand to indicate the problem that tripped the engine light sensor. 


The short answer is that you should not attempt to reset or turn the light off yourself. It is an important safety feature placed in your automobile to warn you about potential problems. A licensed mechanic or automotive technician can turn the light off once the problem that triggered the light to come has been repaired.


Double check the OBDII (check engine light) codes, visit the official OBD codes website:


The check engine light can indicate a variety of problems with your car. It can be something as trivial as a loose gas cap or as serious and costly as a broken catalytic converter. Failure to have the problem properly diagnosed can lead to more serious problems with your vehicle, necessitating more expensive and time-consuming repairs. Consider the following examples and their implications.

  • Faulty Oxygen Sensor: Often referred to as the “O2” sensor, this component measures the level of unburnt oxygen in a vehicle’s exhaust system. It helps maintain a healthy mix of air and fuel entering the car’s cylinders. Faulty O2 sensors can disrupt the fuel-to-oxygen ratio and lead to damaged spark plugs or catalytic converters.
  • Gas Caps: Believe it or not, the critical warning of a check engine light could be nothing more than a loose or worn out gas cap. When the cap allows air to penetrate, it activates the sensor. Tighten your gas cap before scheduling an appointment. The problem is more common than people realize.
  • Faulty Catalytic Converter: Late-model vehicles running on gasoline utilize catalytic converters in their exhaust systems to turn carbon monoxide into carbon dioxide. When clogged, the check engine light comes on. This failure can often be avoided by regular maintenance and oil changes.
  • Faulty Spark Plugs: Outdated spark plugs can cause serious engine misfires that can dangerously impact driving. When faulty plugs misfire, a vehicle could fail to accelerate as expected or result in the car shutting off entirely. Spark plugs are routinely checked or replaced during a tune-up service. If you haven’t had your car serviced in a while, damaged spark plugs may go unnoticed until a misfire.
  • Faulty Ignition Coil: Similar to the risk associated with faulty spark plugs, the engine coil supplies the electricity needed for those components to fire. Faulty coils can result in plugs failing to fire.
  • Faulty Wires: Coils, spark plugs and the wires that connect them are vital to a car functioning as expected. Worn or damaged wires can create uneven electrical current flow and result in misfires. If the check engine light comes on and you experience a rough idle or declining performance, the wires may require replacement.
  • Faulty Air Flow Sensor: When this sensor begins to fail, a variety of hazardous driving conditions may occur. These include the car’s inability to adjust to new altitudes, rough idling, difficulty starting, and sudden jolts in the gas pedal. This malfunction is dangerous.
  • Alarm System: Damaged or improperly installed, aftermarket alarm systems can play havoc with a vehicle. They can be overly sensitive and activate from strong winds, drain the battery, or prevent drivers from being able to start the vehicle. The check engine light may be an early warning sign.
  • Vacuum Leaks: This system is tasked with managing the brake booster and lowering emissions among other things. Faulty vacuum systems may cause a surge in the vehicle’s idle or make it ramp up the RPMs. The vacuum hoses tend to dry out and crack over time or from exposure to severe heat.
  • Faulty Recirculation Valve: This system regulates the smooth operation of a vehicle by lowering nitrogen oxide output and emissions from the engine. The check engine light may come on when this valve begins to clog.
  • Faulty Battery: When a vehicle’s battery starts to lose charge, the check engine light is an early warning that can help avoid a total shutdown. Cars will not run without electricity. The solution will generally be a relatively inexpensive battery replacement and systems reset.

Avoid So-Called “Free” Diagnostic Checks

One of the latest marketing strategies used by auto parts stores and other businesses is offering a “free” scan when you check engine light comes on. Several companies are performing what they call “diagnostics” and “scans” that claim to save you the time and expense of scheduling a review by an experienced auto repair professional. An inexperienced or uncertified counter clerk may run a quick test and show you which part may fix your problem, or they may simply advise you to reset the light afterward and you’re all set. Follow this advice and you may very well be looking at the check engine light again within 24 hours. Many dissatisfied customers then try to get their money back for the part and those refunds will be denied.

A vehicle is likely to fail the Texas safety inspection with the check engine light on and simply disengaging the battery to reset the error code will not help. Inspection facilities are required to run a scan of a car’s onboard diagnostic computer – the same computer that triggers the warning light in the first place. Save yourself the headache of a failed inspection and another repeat trip to the shop – get it fixed right the first time!

The old saying that nothing good is free holds true when your check engine warning lights up. It’s important to have an experienced auto repair specialist perform a professional assessment of your vehicle and get it fixed right the first time.

What to Do When Your Check Engine Light Activates

When the check engine light comes on, it’s only natural to be concerned about the safety and the expense of having your vehicle repaired. While the early warning system may not indicate a serious malfunction, it’s important to schedule an appointment with a professional to diagnose the problem and complete the necessary repairs.

Check engine warnings generally provide car owners with a modest time buffer between the start of a malfunction and being placed in harm’s way. When lit, the engine icon indicates that one or more systems are failing, and extended driving could result in excessive and more costly damage to your vehicle.

The best solution to dealing with the unnerving check engine light is to take your vehicle one of our Houston-area repair shops to have the problem properly and promptly diagnosed. The alternatives include being broken down on the side of the road, further damage to the vehicle, and more costly repairs. Don’t risk further damage to your car, call us today!


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  1. FAQs: OBDII Emissions Testing, Texas Department of Public Safety. Retrieved September 11, 2019 from
  2. OBDII (Check Engine Light) Trouble Codes, Your OBD-II Trouble Codes Repair Site. Retrieved September 11, 2019 from


  • Defective spark plug or wires
  • Failing catalytic converter
  • Bad oxygen sensor
  • Exhaust system issues
  • Loose or broken gas cap
  • Alarm system malfunction
  • Ignition Coil
  • Vacuum Leak

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