Engine Diagnostics and Check Engine Light in Flagstaff and Phoenix, AZ

Your vehicle’s engine is its heart, and when the check engine light comes on, it’s your car’s way of telling you something’s not right. Today’s vehicles rely on a complex network of sensors and computer systems to monitor engine performance and emissions. When any of these components malfunction, it triggers the check engine light. At Randy's Downtown Garage in Flagstaff and Phoenix, AZ, our ASE-certified technicians are experts in engine diagnostics and check engine light repair. We use advanced tools to pinpoint the exact cause of the problem and get you back on the road with confidence.

Engine Diagnostics in Flagstaff and Phoenix, AZ

We service all makes and models, including domestic, European, and Asian vehicles. Our team combines years of experience with state-of-the-art diagnostic equipment to ensure accurate, efficient repairs. Whether it’s a faulty sensor, ignition issue, or emissions system fault, we get to the root of the issue quickly. All repairs are backed by our 2-year/24,000-mile warranty, so you can count on our work to last. Watch for these common signs that your engine needs professional attention:



  • Check engine light is flashing or stays on

  • Engine misfiring or running rough

  • Reduced fuel efficiency

  • Unusual engine noises

  • Poor acceleration or stalling

  • Failed emissions test

If you’re experiencing any of these symptoms, don’t ignore them—bring your vehicle into Randy's Downtown Garage. Our expert technicians will run a full engine diagnostic scan and perform a detailed inspection to isolate the issue. We’ll explain the problem in simple terms and recommend only the repairs you actually need. Prompt diagnostics and regular engine maintenance help prevent major damage and costly repairs down the line.

We know auto repairs can disrupt your schedule, which is why we go the extra mile for your convenience. Enjoy free shuttle service, or let us arrange a complimentary Uber or Lyft ride while we work on your vehicle. Whether you visit our Flagstaff or Phoenix location, you’ll receive the same high-quality service and customer care in a clean, welcoming environment.

Check Engine Light Diagnostics in Flagstaff and Phoenix, AZ

Don’t wait for minor engine issues to become major problems. For reliable engine diagnostics and check engine light service in Flagstaff and Phoenix, AZ, call your preferred Randy's Downtown Garage location or book your appointment online today.

Engine Diagnostics At Randy's Downtown Garage - We Diagnose Properly The First Time Around.