What to Expect from Check Engine Light Diagnostics
A diagnostic trouble code identifies a condition detected by the vehicle’s onboard diagnostics. It doesn’t automatically prove that a particular component has failed. Before discussing repairs, we compare the code with the light’s behavior, reported symptoms, visual findings, live data, and appropriate system testing.
1. Tell Us What Happened
When you schedule service, share when the light appeared, whether it flashes, and whether you’ve noticed changes in starting, acceleration, fuel economy, or engine performance. These details help guide our evaluation.
2. Review the Diagnostic Findings
Our technicians use manufacturer-quality equipment to evaluate the affected systems. You’ll receive a digital vehicle inspection report with pictures and videos of our findings and recommendations. A service advisor can then explain the results in clear, understandable language.
3. Decide on the Next Step
We review our recommendations with you before authorized work begins. Depending on the findings, the next step may be a repair, additional testing, monitoring, or arranging transportation if the vehicle shouldn’t be driven. Most work can be completed immediately or scheduled based on parts and your availability.
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.
Clear Findings & Recommendations for Lockport Drivers
Our ASE-certified technicians evaluate concerns involving the engine, emissions system, ignition system, fuel system, electrical components, and vehicle drivability. An owner/operator is on site to provide direct accountability throughout your visit, while complimentary shuttle services can help you continue your day.
Before you authorize work, we explain what we found, what service we recommend, and why. You’ll have the information needed to compare the diagnosis with the proposed repair and make an informed decision.
Work performed at Christian Brothers Automotive Lockport includes a 3-year/36,000-mile warranty, honored at participating Christian Brothers Automotive locations nationwide. Our service advisor can explain how the warranty applies to an approved repair.
Plan Your Warning-Light Inspection
Request an appointment and share your vehicle’s symptoms, recent performance changes, and whether the light is steady or flashing. We’ll use those details as part of a complete diagnostic evaluation rather than treating a stored code as the final answer.
Why a Code Read Isn’t a Complete Diagnosis
A code reader can retrieve stored or pending diagnostic trouble codes. Those codes identify a monitored system or detected condition, but several faults can produce similar readings. Replacing a component based only on the code may not correct the underlying problem.
A complete evaluation interprets codes alongside symptoms, live data, visual findings, and component testing. Clearing a code without correcting its cause can allow the malfunction indicator light to return while leaving the original condition unresolved.
What Steady & Flashing Check Engine Lights Mean
A steady warning generally means your vehicle should be inspected promptly, even if it appears to drive normally. Don’t postpone service simply because the light turns off. Intermittent faults can leave stored information that helps guide testing.
A flashing light can indicate an active misfire that may damage emissions components. Reduce the risk by stopping in a safe location and arranging professional assistance. Don’t continue driving if the vehicle is shaking severely, overheating, smoking, losing substantial power, or producing a strong fuel odor.
Check Engine Lights & Illinois Emissions Testing
Illinois emissions testing uses onboard diagnostics for many eligible vehicles. The applicable test may review system readiness, malfunction-indicator-light status, and stored diagnostic trouble codes. A commanded-on malfunction indicator light with relevant codes can cause an eligible vehicle to fail the onboard diagnostics emissions test.
Clearing codes shortly before testing can reset readiness monitors, which means the vehicle’s systems haven’t completed the required self-checks. Eligibility and testing requirements vary by vehicle and registration circumstances, so confirm the current rules with the Illinois vehicle emissions program.
Get Clear Answers Before Deciding on Repairs
Our Check Engine Light Services connect the warning, stored codes, vehicle symptoms, and system testing so you can understand the problem and the recommended next step.
Schedule Appointment with Christian Brothers Automotive Lockport by calling (815) 426-9532.
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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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"Thank You for your honesty! I took my vehicle in With a screw On A tire thinking it was a flat but NiCo told me there WASN'T any damage Done and Therefore Won’t be a charge for they’re service. Honesty means a lot to me. I Highly recommend Chri"
- S.M