How Our Check Engine Light Service Works
When you schedule an appointment, tell us when the warning light appeared and describe any changes you’ve noticed in starting, acceleration, idling, fuel economy, or other vehicle behavior. Those details give our technicians useful context before diagnostic testing begins.
After you drop off the vehicle, we perform the diagnostic work and complete the courtesy inspection. We then prepare our findings and an estimate for the recommended repair.
You review the results with a service advisor or through the Digital Vehicle Inspection report before authorizing work. Once you approve the recommendation, we perform the repair immediately or schedule it according to parts availability. We’ll explain what we found and answer your questions before moving forward.
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.
Code Doesn’t Identify Cause
A diagnostic trouble code identifies the vehicle system that triggered the warning light. Testing the related sensors, circuits, and components is necessary to identify the underlying condition before a repair is recommended.
See Exactly What We Found
After diagnosing your check engine light, we text you a Digital Vehicle Inspection (DVI) report with photos and videos of our findings and recommendations. You see what our technicians see, in plain terms, before approving any repair.
You can review the documented findings, ask questions, and approve the recommended work through the report. It’s transparency you can verify with your own eyes, not just take on faith.
Flashing or Solid Matters
A flashing warning calls for an immediate response, while a solid light indicates an ongoing fault that needs diagnosis. Either light can appear before you notice a clear change in how the vehicle operates.
Understanding Your Check Engine Light
Not all check engine lights carry the same urgency. Knowing whether the light is flashing or solid helps you decide what to do next, but diagnostic testing is still needed to connect the dashboard alert to the underlying vehicle condition.
Flashing Check Engine Light
A flashing check engine light signals an active, serious problem, most often a cylinder misfire that can rapidly damage the engine or catalytic converter. Don’t drive farther than necessary. Arrange prompt service and bring the vehicle in immediately.
Solid Check Engine Light
A solid check engine light means the vehicle’s computer has detected an ongoing fault. The vehicle may seem to run normally because the computer can identify out-of-range readings before noticeable drivability symptoms appear.
Common solid-light triggers include:
- A loose or faulty gas cap
- A failing oxygen sensor
- Worn spark plugs or ignition coils
- Catalytic converter faults
- Mass airflow sensor issues
Diagnose a solid light as soon as possible, since unresolved faults can affect emissions, fuel economy, and engine performance.
Schedule Your Check Engine Light Diagnostic
Our free check engine and dash light code scan is available at our Litchfield Park location through December 31, 2026. Additional diagnostic charges may apply when testing beyond the initial code scan is needed. Use our online contact form to request an appointment.
We work with all major extended warranty providers. Ask us to confirm whether your coverage applies when scheduling.
Call (623) 343-1759 to arrange your visit. Our online contact form includes the details we’ll need.
A Code Scan Is a Starting Point, Not a Diagnosis
Many auto parts stores offer a free OBD-II scanner read. OBD-II is the standardized onboard diagnostics system that stores trouble codes when the vehicle computer detects a fault. The code identifies the affected system, but it doesn’t identify the failed component by itself.
Clearing a code without repairing the underlying condition only turns off the warning light temporarily. The code and light return when the vehicle’s computer detects the fault again.
Professional check engine light diagnostics involve live data analysis, sensor testing, and hands-on component evaluation that a basic code reader can’t replicate. Our technicians retrieve the codes, inspect related systems, test sensors, and use manufacturer-quality diagnostic equipment to identify the root cause before recommending a repair.
Check Engine Lights & Arizona Emissions Inspections
Arizona emissions testing applies in the Phoenix metropolitan area, including Litchfield Park. A vehicle can’t pass the emissions inspection while its Check Engine light is on, so clearing the dashboard alert without correcting the fault isn’t a lasting solution.
Readiness Monitors are onboard computer routines that determine whether the vehicle’s emissions systems are ready to be tested. A vehicle can be rejected when too many monitors show “not ready,” even when no current trouble code is present.
Disconnecting the battery and completing certain repairs can reset these monitors. The vehicle then needs a drive cycle, which is a pattern of normal driving that allows the vehicle computer to rerun its emissions checks. Completing the required drive cycle before returning for Arizona emissions testing gives the monitors time to report their status.
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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 to Christian Brothers for top notch PROFESSIONAL Service. They cared and I APPRECIATE their efforts."
- Don Powers