Check Engine Light Diagnostics 101

Check Engine Light Diagnostics Technician

Why Your Check Engine Light Turns On

Today’s vehicles are very complicated. In fact, the vehicles of today can be considered a computer on wheels! Every system component from brakes to the amount of fuel entering the engine is controlled by the vehicle’s on-board computer system and a series of sensors.

When the engine light illuminates on the dashboard, this is an indication that most likely something has gone wrong with one or more of the systems your vehicle relies on to keep it running properly.

It is imperative that a qualified technician with the proper equipment diagnose the problem when an engine light comes on. Sullivan Tire is proud to staff some of the most qualified technicians in the industry. In fact, we have well over 100 ASE Certified Master Technicians on staff and we invest in the training and equipment to help our technicians fix any vehicle on the road today.

Diagnosing a Check Engine Light

To diagnose why a check engine comes up, a qualified Sullivan Tire and Auto Service technician will connect a scan tool to your vehicles on-board computer system. The on-board computer will communicate to the scan tool in the form of special codes that will help the technician track down the problem.

In most cases, the technician will have to go through a complicated diagnosis flow chart procedure to not only track down the problem, but to also determine why it happened in the first place so it can be repaired properly and not be a recurring problem for you.

If your check engine light is on, make an appointment at one our locations as soon as possible. We have the tools and experience to diagnose check engine lights on just about every vehicle on the road today, including BMW, Mercedes, Audi, Mini, Lexus, Volvo, Toyota, Nissan, Ford, GM, Chrysler, Kia, and more!

Schedule your Check Engine Light Diagnostics appointment today!

Investing in our People and State-of-the-Art Equipment

Every vehicle manufacturer has a different scan tool specific for that car’s make. A typical car dealer only has the scan tool for the particular car they sell (Ford for example), which means that is the only vehicle they can diagnose. Sullivan Tire and Auto Service has invested in factory level scan tools for every common vehicle on the road today. So, whether you drive a Ford, Lincoln, Dodge, Toyota, Nissan, Honda, BMW, Audi, Volvo, Mercedes, and so on, we have the tools to diagnose the problem.


We have the technicians, knowledge and experience to fix whatever you drive. Every location is staffed with ASE Certified Technicians, and we have over 100 ASE Master Technicians on staff. They are passionate about their work and committed to getting you back on the road quickly! We know how important your vehicle and be to you and your family.

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