Check Engine Light Diagnostic

The Check Engine Light is an indicator on a vehicle's dashboard that alerts the driver to a variety of potential engine and emission system issues.

Recent Repairs on 

Check Engine Light Diagnostic

Recent stories from work we complete everyday with cars that have these problems.

Service Stories
October 13, 2025

2018 GMC Acadia Service Steering Assist Warning: Thermostat Fix

2018 GMC Acadia Service Steering Assist warning fixed in Omaha. Gateway Auto diagnosed thermostat causing P0128 code and steering warning, replaced housing assembly.
Service Stories
August 29, 2025

Does an exhaust leak cause a check engine light on a 2004 Toyota Tundra?

2004 Toyota Tundra Limited exhaust after oxygen sensor repair to fix check engine light caused by missing exhaust sensor.
Service Stories
August 8, 2025

Why is my 2008 Toyota RAV4 hesitating when I press the gas pedal?

When this RAV4's check engine light came on with code P0137 and the engine started hesitating during driving, Gateway Auto's diagnostic testing revealed failing downstream oxygen sensors on both banks.

How can we help?

An FAQ section can only get you so far. Still have questions or want more information than what's provided in our FAQs? Our friendly team of experts is happy to help.

Frequently asked questions

If it's a car, we'll fix it. If it's a question, we'll answer it.

Are your technicians trained and certified to diagnose complex, modern vehicles?

Yes! Our team is made of up ASE certified master technicians with decades of industry experience. They carry a wealth of knowledge, as well as the updated tools and training to diagnose modern vehicles with their complex computer systems.

Is it safe to drive my car if the check engine light is on but not flashing?

If the check engine light is on steadily and not flashing, it generally indicates a less severe issue. While it may be safe to drive in some cases, we recommend scheduling an appointment for a diagnostic check to identify and address the problem promptly, thus preventing more serious damage or safety risks.

Can I check the engine codes myself using an OBD-II scanner?

While you can use an OBD-II scanner to retrieve engine codes, the codes only provide a starting point for diagnostics and do not necessarily pinpoint the exact problem. Our certified technicians have the expertise and tools to interpret the codes accurately and perform a comprehensive diagnosis.

Why is my check engine light flashing?

If the check engine light is flashing, it indicates a severe problem that requires immediate attention. In such cases, it's best to pull over safely and have the vehicle towed to the shop for diagnostics.

What does it mean if my "check engine" or "service engine soon" light comes on?

There are many electronic components and sensors that manage your vehicle's emissions and performance. When one of these fails, the "check engine" light or "CEL" is illuminated (commonly yellow) on your dashboard. Although your car may seem to run or drive fine, it is important to have the issue addressed to prevent damage from occurring. There are times when a check engine light is a simple fix, and others where it is a much more serious problem.

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