What to Expect with a Check Engine Light Diagnostic Service
1. Schedule Your Appointment
Whether scheduling online or over the phone be sure and let us know what you're experiencing so we can provide fast and accurate service advice.
2. Diagnostics and Inspections
Drop off your vehicle and the shop will get to work with inspections and diagnostics using the same equipment as the manufacturers to determine issues and next steps.
3. Digital Vehicle Inspection Report and Estimate
Following the diagnosis we will text you a digital vehicle inspection report, containing pictures and videos of our findings and recommendations.
4. Review and Approval
A service advisor will reach out to walk you through the findings and recommendations to determine how you would like to proceed, or you can approve work directly in your DVI.
5. Work Performed or Scheduled
Most work can be completed immediately, or scheduled based on parts and customer availability.
Backed by the Nice difference. Warranty
Every repair we perform is covered by our Nice difference. 3-year/36,000-mile warranty, whichever occurs last. That coverage travels with you. If you’re away from Flower Mound, any Christian Brothers Automotive location nationwide will honor it. We also work with all major extended warranty providers, so your existing coverage can work here too.
Check Engine Light explained
Flashing vs. Solid Check Engine Light: What the Difference Means
Not every check engine light carries the same urgency. A solid, steady light means a sensor has detected something outside normal parameters. It could be a faulty sensor, an emissions issue, or something affecting fuel efficiency. The vehicle may feel fine to drive, but performance and fuel mileage can still be affected, and delaying service risks a bigger repair down the road.
A flashing check engine light is a different situation. That signal typically points to an active cylinder misfire, which can damage your catalytic converter quickly. If your light is flashing, stop driving as soon as it’s safe and have the vehicle brought in without delay.
If the light is on alongside rough running, loss of power, or unusual sounds, pulling over rather than driving to a shop is the safer call. When nothing feels wrong but the light stays on, schedule service promptly. A small issue like a loose gas cap can trigger the light, but so can a failing oxygen sensor or an early emissions system fault.
Common Reasons Your Check Engine Light Is On
The check engine light connects to your vehicle’s OBD-II system, which has monitored engine and emissions performance on every car sold in the US since 1996. When something falls outside acceptable limits, a fault code is stored and the light activates. A basic OBD-II code scan tells you which code is stored. It doesn’t tell you why.
That distinction matters. Replacing parts based on a code alone, without tracing the root cause, often means replacing components that aren’t actually at fault. Our technicians interpret fault codes in context, which supports accurate repairs.
Common triggers include:
- Loose or damaged gas cap: Creates an evaporative emissions leak, one of the most frequent and easiest fixes
- Faulty oxygen sensor: Affects fuel efficiency and emissions readings
- Worn or misfiring spark plugs: Causes rough engine performance and can worsen quickly
- Failing catalytic converter: Increases emissions and can lead to further engine damage if ignored
- Transmission, electrical, or engine faults: Broader system issues that require full diagnostic interpretation
Frequently Asked Questions
Can I Drive with the Check Engine Light On?
If the light is solid and the vehicle feels normal, it’s generally safe to drive to our Flower Mound shop. Don’t delay, though. What starts as a minor fault can become a breakdown or a more expensive repair if left unaddressed.
What If the Light Is Flashing?
Stop driving immediately. A flashing light signals an active problem that can cause rapid damage. Have the vehicle towed or brought in without driving it further.
What If Nothing Feels Wrong?
The light may point to a minor issue like a loose gas cap or a beginning oxygen sensor fault. If it doesn’t clear on its own within a short time, schedule an inspection. Ignoring it assumes the best-case scenario, which isn’t always accurate.
Does My Extended Warranty Cover This?
Christian Brothers Automotive works with all major extended warranty providers. When you schedule your check engine light service in Flower Mound, let us know you have extended coverage and we can confirm what applies before any work begins.
Your Local Christian Brothers Amenities
FAQs
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Q. "What is the difference between a steadily lit and a flashing check engine light?"A steadily lit light means that a sensor is sending a signal to your vehicle's computer that something is wrong or it could simply mean that the sensor is out. If your check engine light is flashing, however, that means there is a serious issue and you should stop driving immediately.
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Q. "Why is my check engine light on but nothing seems to be wrong with my vehicle?"If nothing within your vehicle stands out, then it is possible that it is just a minor issue such as a loose gas cap or a bad O2 sensor. It is still recommended to see a mechanic if the light doesn't disappear to check for any larger issues.
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Q. "Do you offer a warranty?"As part of our Nice difference.® commitment to providing our customers the best auto service experience possible, we also offer a3-year/36,000-mile warranty on all the work that we do. We offer this warranty at every Christian Brothers Automotive nationwide, and it will be honored at any location, regardless of which branch did the initial work.
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Q. "Can you provide service under my extended warranty?"Yes. At Christian Brothers Automotive, we work with all major extended warranty providers to make needed repairs for our customers. If you have an extended warranty, you can discuss your carrier with our team when scheduling an appointment and confirm that the work will be covered. You can find a partial list of the extended warranty companies we work with here.
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Q. "What to do if your check engine light turns on?"We recommend heading to your local auto shop as soon as you are able. This is typically a sign that there is an abnormality within your engine.
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Q. "Is it safe to drive your car when the check engine light is on?"It depends. If you are experiencing other noticeable issues with your vehicle, it may be best to pull over. Otherwise, it is typically okay to drive to your local auto shop. You will want to get this checked sooner rather than later to avoid being stranded with a broken-down car.
Have more Questions?
Our friendly auto service experts have the answers.
Call your local Christian Brothers Automotive car shop today
Hear What Our Customers Had to Say About Us
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"I liked the customer service and going above and beyond to make sure I was comfortable while waiting in the store for my vehicle work to be done, specifically being offered a nice hot coffee with creamer."
- J.L.