How Our Check Engine Light Diagnostic Process Works
The process begins when you schedule an appointment. When your vehicle arrives, we start with a Courtesy Inspection of its major systems to establish a baseline before focusing on the warning light.
Our ASE-certified technicians use manufacturer-level equipment to read the stored diagnostic trouble codes. We then inspect the affected systems visually and mechanically to verify the underlying cause rather than treating a code as a final diagnosis.
You receive a texted Digital Vehicle Inspection report with pictures and videos documenting what we found. A service advisor reviews the findings with you in plain language before any repair work is performed or scheduled.
You authorize the work before it begins, with a clear explanation of the confirmed problem and recommended repair.
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.
Manufacturer-level equipment helps our technicians evaluate the systems connected to a stored trouble code. Repairs aren’t recommended until the root cause is confirmed.
Convenience & Clarity at Our Aurora Location
Leaving your car for diagnostics doesn’t have to disrupt your day. With our complimentary shuttle service, you can drop off your vehicle and get where you need to go while we work.
When the diagnostic is complete, we explain our findings in plain language, without jargon or guesswork. You receive updates before approving any work, so you remain informed at every step.
Every visit begins with a Courtesy Inspection of the vehicle’s major systems before check engine light diagnostics focus on the systems identified by stored codes.
Aurora Check Engine Light Service & Illinois Emissions Testing
Illinois operates a vehicle emissions inspection program in designated areas under the Illinois Vehicle Emissions Inspection Law of 2005, 625 ILCS 5/13C. Whether an Aurora driver is subject to testing depends on the vehicle’s registration ZIP code and eligibility.
In designated testing areas, most gasoline-powered passenger vehicles from model year 1996 or newer require testing after they’re more than four years old. Retesting occurs every two years in connection with license plate renewal.
An unresolved check engine light or stored diagnostic trouble code can cause an Illinois emissions-test failure and delay registration renewal. Diagnosing the underlying fault before testing gives you a clear repair recommendation based on the vehicle’s actual condition.
Every visit to Christian Brothers Automotive Aurora begins with a Courtesy Inspection that provides a baseline view of your vehicle’s major systems. From there, we read the stored codes and inspect the systems they identify.
An OBD-II code identifies the circuit or system that reported a fault. It doesn’t identify the specific failed component or explain why the fault occurred. A professional diagnosis is a reliable way to avoid unnecessary repairs.
Once repairs are completed, we reset the check engine light and confirm that the fault condition has been resolved. We only recommend services your vehicle actually needs, and you authorize every step before work begins.
Call (331) 343-5161 to arrange an appointment for check engine light diagnostics in Aurora, Illinois.
Common Reasons a Check Engine Light Comes On
The check engine light can be triggered by a wide range of conditions. Some are minor, while others indicate serious system faults that worsen if left unaddressed.
Frequent triggers include:
- Loose or faulty fuel cap
- Failing oxygen sensor
- Failing catalytic converter
- Failing mass airflow sensor
- Worn spark plugs or failing ignition coils
- Weak battery
- EGR valve problems
- Vacuum leaks
Because the vehicle’s diagnostic system reports the circuit that flagged the fault rather than the exact failed part, a code reader alone can’t identify what needs to be fixed. The affected system must be inspected to confirm the cause before parts are replaced.
Ignoring the light can lead to reduced fuel efficiency, higher emissions, accelerated engine wear, and more expensive repairs as the underlying issue worsens. Prompt diagnosis identifies what the vehicle needs before additional problems develop.
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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"As always perfect customer service and a job. Well done in a timely manner. Thank you so much to the team."
- Ingrid