How Our Check Engine Light Diagnostic Visit Works
We keep the process clear from the moment you arrive. Our technicians use manufacturer-quality equipment at every stage, and nothing moves forward until you understand your options.
- Connect and retrieve: We plug into your vehicle’s OBD-II port to pull all stored diagnostic trouble codes and freeze frame data recorded at the moment each code was set.
- Inspect and confirm: A code identifies the system involved, not always the failed part. We inspect the flagged system to confirm the root cause before recommending any repair.
- Explain and estimate: You receive a clear explanation of what we found and a written estimate. Repairs only proceed with your approval.
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.
See the Problem Before You Approve the Repair
Every diagnostic visit at Christian Brothers Automotive Lone Tree includes a free Digital Vehicle Inspection. Our technicians photograph your vehicle during the inspection, so you see the actual condition of the components involved rather than just a description. When the check engine light is on, that photographic record can show you what may be triggering it. You make repair decisions based on evidence, not just our word for it.
What Could Be Triggering Your Check Engine Light?
The causes range from a loose gas cap to an active engine misfire. Knowing the difference matters, and so does acting at the right time.
Common Causes & What the Light Behavior Tells You
Several systems can trigger the malfunction indicator lamp. The most frequent culprits include a loose or faulty gas cap, a failing oxygen sensor, a deteriorating catalytic converter, a mass air flow sensor malfunction, worn spark plugs or ignition coils, and EGR valve problems. Some of these are inexpensive fixes. Others, left unaddressed, can lead to more significant damage.
The light’s behavior gives you a first clue about urgency. A steady light means a problem exists and should be checked soon, but it isn’t a signal to pull over immediately. A flashing check engine light is different: it typically indicates an active engine misfire, which can overheat and damage a catalytic converter in a short time. If your light is flashing, reduce your speed and have the vehicle inspected promptly.
Schedule Your Diagnostic Appointment
Any repairs we perform are covered by our Nice Difference Warranty: 3 years or 36,000 miles, whichever occurs last. We also offer complimentary shuttle service so a diagnostic appointment doesn’t interrupt your day.
Call (720) 709-2828 or schedule online. Our team at Christian Brothers Automotive Lone Tree is ready to diagnose your check engine light and help you get back on the road with confidence.
Check Engine Light & Colorado Emissions Inspections
Centennial vehicles registered in Arapahoe or Douglas County fall within Colorado’s Denver-metro and North Front Range vehicle emissions testing program. An illuminated check engine light causes an automatic failure of the OBD portion of that inspection, and the vehicle must be repaired and reinspected before it can pass. Most gasoline vehicles in the program area are exempt for their first seven model years, then tested every two years after that. If your registration renewal is approaching, addressing the check engine light now can help you avoid a failed emissions test and a second trip to the testing station.
Why Reading a Code Isn’t Enough
Freeze frame data captures your vehicle’s operating conditions at the exact moment a trouble code was stored: engine speed, load, temperature, and fuel trim values, among others. That snapshot is especially useful for intermittent problems that don’t reproduce easily on a test drive. A code alone identifies a system; freeze frame data combined with a hands-on inspection helps confirm whether the failure is consistent or situational. That distinction can change the repair recommendation, which is why we verify the root cause before any work is approved.
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.