From Diagnostic Testing to Repair Approval
Your visit begins with scheduling and an evaluation of the check engine light concern. After completing the diagnostic testing and inspection, we send you a digital report with photos or videos of the findings and an estimate for the recommended work.
A service advisor reviews the findings with you, explains the available options, and answers your questions before work proceeds. You can approve recommended repairs through the digital inspection report. We then perform the approved work or schedule it for a later date.
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.
Extended Warranty Provider Coordination
We work with all major extended warranty providers and can coordinate with your carrier when you schedule service. The repair estimate identifies the recommended work that may need to be submitted for review.
Coverage and authorization depend on the terms of your vehicle service contract. Have your extended warranty information available when scheduling so we can coordinate with the provider.
The Nice Difference® Warranty
Every check engine light repair we perform is covered by the Nice Difference® Warranty: 3 years or 36,000 miles on both parts and labor, whichever limit occurs last, valid at any Christian Brothers Automotive Round Rock location nationwide.
We recommend only what your vehicle actually needs, explained in plain language, with no pressure. That’s what treating every customer like a neighbor looks like in practice.
What to Note Before Your Diagnostic Appointment
You don’t need to diagnose the problem yourself, but a few observations can help us understand when and how the warning appeared. Note whether the check engine light is steady or flashing and whether you’ve noticed changes in idle quality or acceleration.
Tell us if the light appeared after refueling or after another noticeable change in how the vehicle operates. These details help connect the stored diagnostic trouble codes with the behavior you’ve experienced, but they don’t replace component testing.
How We Verify a Check Engine Light Repair
Clearing a diagnostic trouble code doesn’t establish that the underlying condition has been repaired. Once you approve the work, our technicians repair the identified fault using high-quality parts and test the affected components again.
Verification testing confirms that the repaired system is operating as expected and that the original check engine light condition has been resolved before we return the vehicle.
The check engine light is one of the most misunderstood indicators on the dashboard because its range is so wide. A loose gas cap and a serious engine misfire can trigger the same light. Knowing the most common causes helps you understand what you may be dealing with before you arrive.
Common causes provide useful context, but they don’t identify the fault in an individual vehicle. Accurate testing determines which engine, ignition, fuel, airflow, or emissions condition activated the warning.
Common Causes of a Check Engine Light
These are the triggers we see most often in Round Rock vehicles:
- Loose or missing gas cap: Affects fuel system pressure and allows vapors to escape. One of the easiest fixes, but still worth confirming.
- Failing oxygen (O2) sensor: Causes the engine to burn more fuel than necessary and can lead to catalytic converter damage if left unaddressed.
- Faulty mass airflow (MAF) sensor: Disrupts the air-fuel mixture, reducing fuel efficiency and engine performance.
- Worn or failing catalytic converter: Affects emissions and often results from earlier warning signs that went unaddressed.
- Worn spark plugs or spark plug wires: Cause incomplete combustion, lowering performance and fuel economy.
- Engine misfire: Can damage the catalytic converter and other components quickly, particularly when the check engine light is flashing rather than steady.
Steady vs. Flashing: What Your Check Engine Light Is Telling You
A steady check engine light means the OBD-II system has detected a fault. It warrants a diagnostic appointment but doesn’t typically require pulling over immediately. A flashing check engine light is different: it signals an active engine misfire that can cause rapid damage to the catalytic converter and related components. If your light is flashing, prompt service can keep a manageable repair from becoming a much larger one.
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.