How Our Check Engine Light Service Works
From the moment you schedule to the moment you drive away, our process keeps you informed and in control.
We start by documenting the symptoms you’ve experienced, then test the relevant vehicle systems and prepare a plain-language report that often includes photos. You review the findings and approve any repair before work begins. After an approved repair is completed, we perform a final system check.
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.
What to Note Before Your Diagnostic Appointment
Details about when and how the warning appears help document an intermittent or recurring concern. A light that turns off can still reflect a previously detected fault.
Before your appointment, note:
- Warning-light behavior: Record whether the light stays on, flashes, or turns off after driving
- Timing and conditions: Note when the light first appeared and whether it returns during starting, idling, or acceleration
- Performance changes: Mention rough idling, difficult starting, reduced acceleration, unusual fuel use, or other changes in engine performance
The Nice Difference® Warranty
Every repair that follows a check engine light diagnosis at Christian Brothers Automotive West Chicago is covered by the Nice Difference® Warranty: 3 years or 36,000 miles, whichever limit occurs last. Because coverage ends when the later limit is reached, lower-mileage drivers get the full time coverage available under the warranty.
The warranty covers defects in new parts and improper installation, and it’s honored at any Christian Brothers Automotive West Chicago location nationwide. Keep a copy of your original repair invoice to present if you ever need service under the warranty.
Steady vs. Flashing Check Engine Lights
A check engine light that stays on steadily signals that your vehicle needs service and should be diagnosed as soon as possible. Your vehicle has detected a fault, even if it still starts and drives normally.
A flashing check engine light indicates a severe engine misfire. Reduce your speed and seek service as soon as possible because continued driving can seriously damage emissions-control components, including the catalytic converter.
The light can turn off after the diagnostic system completes three consecutive evaluations without detecting the original problem. That doesn’t erase the fact that a fault was previously detected, so make a note of the warning and any related performance changes.
What Can Trigger a Check Engine Light?
The check engine light, technically called the malfunction indicator lamp, illuminates whenever your vehicle’s onboard diagnostic system detects a fault. Common triggers include:
- A loose or faulty gas cap
- A failing oxygen sensor
- A worn catalytic converter
- A faulty mass airflow sensor
- Misfiring spark plugs or ignition coils
- Faults in the evaporative emission control system
The same warning illuminates for both minor and serious faults. Modern vehicles can detect problems before you notice any change in how the car drives, so a fault code may be active while everything feels normal. Only a diagnostic scan combined with a technician’s evaluation can confirm the cause.
Get a Clear Answer About Your Check Engine Light
Our check engine light services in West Chicago identify the fault behind the warning and give you documented findings before you make a repair decision. Our contact page also lets you share the symptoms you’ve noticed with us directly.
Call Christian Brothers Automotive West Chicago at (630) 491-8321 to schedule check engine light diagnostics.
The Check Engine Light & Illinois Emissions Testing
Illinois requires emissions testing every two years for registered vehicles in designated counties, including DuPage County. Most gasoline-powered passenger vehicles from model year 1996 or newer are subject to this testing. For most vehicles, the state reads OBD data rather than measuring exhaust with a tailpipe probe.
A vehicle fails Illinois OBD testing when the malfunction indicator lamp is commanded on and trouble codes are present. After the underlying fault is repaired, the vehicle’s OBD readiness monitors must return to a ready status through normal driving before it can pass a retest. A drive cycle is the sequence of operating conditions the onboard computer uses to run these system checks. Addressing the fault promptly can help you avoid a failed test or a registration delay if your vehicle is subject to DuPage County testing requirements.
Clearing trouble codes or disconnecting the battery resets readiness monitors to not ready. The catalyst and evaporative emissions system monitors can take longer to reset than other monitors, so clearing a warning immediately before an emissions retest can leave the vehicle unready for testing.
What to Expect When You Bring Your Vehicle In
Many drivers put off a check engine light diagnosis because they’re concerned about cost or being steered into repairs they didn’t request. Before any repair begins, your service advisor explains the recommended work and provides a clear estimate.
You decide whether to proceed after reviewing the findings. If you authorize the work, our complimentary shuttle service can help you continue your day while the vehicle is at our West Chicago location.
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.