Engine Diagnostics in Addison, TX

If your car or truck isn’t operating as it once was — or a warning light has popped up — it’s time to get an engine diagnostic from a qualified mechanic. At Eagle Transmission and Auto Care of Addison, TX we use state-of-the-art computer diagnostics along with good old-fashioned visual inspections to diagnose even the most complex engine problems.

Today's engines are under the control of sensors and electronic modules. When something goes wrong, your vehicle stores error codes — but there’s more to the story than they can tell. Our professional technicians exceed the minimum with every service call to ensure that we accurately diagnose what’s happening and offer accurate guidance on what needs to be done.


What Is Engine Diagnostics?

Engine diagnostics includes using technology to test for performance issues, sensor failures or internal damage. It typically includes:

  • Reading the vehicle's computer to clear error codes (OBD-II).
  • Real time data analysis of the signals from engine sensors,
  • Inspection of main parts and components in site
  • Validating Issues via Road-Testing or Manual Testing
  • Having the confidence that you know what is causing a problem (before suggesting repairs)

This procedure prevents unnecessary part replacement with your vehicle returning to properly operating performance faster.


When You Need an Engine Diagnostic

If you experience any of these symptoms, you should schedule an engine diagnostic:

  • Check engine light is on or flashing You’re driving along, minding your own business, and away from nowhere the dreaded check out engine light pops through to the dashboard.
  • When Car is stopped, car shakes idles rough at traffic light
  • Poor fuel economy
  • Lack of power or sluggish acceleration
  • Failure to start, stalling or misfiring of engine
  • Strange odors or sounds coming from under the hood
  • Reduced performance or driveability issues

These symptoms are not only indicative of potential disaster for your car, but in many cases can also spell early warning signs of serious issues.


Remember, most engine malfunctions can be avoided with regular maintenance.



By taking care of minor engine problems early, you will save a costly engine rebuild somewhere down the road. Auto engine services are a vital part of a driver and his desire to have his car in the best working condition.


It is important to have the engine checked and double checked to ensure that it is good to go.


From routine maintenance to major engine replacement or repair, Eagle Transmission’s Certified Service experts are trained and equipped with the expertise on engine repair and the skills to maintain your vehicle’s optimal performance.


Contact us today! We guarantee the perfect condition of these engines for your satisfaction.


Common Issues We Diagnose

Our shop in Addison routinely discovers and repairs:

  • Defective spark plugs or ignition coils
  • Fuel Injectors and system failures
  • Sensor malfunctions (O2, MAF, MAP, camshaft/crankshaft)
  • There is no vacuum leaks and all air hoses are connected.
  • Exhaust system backpressure problems
  • Timing system or VVT errors
  • Wiring or ECU communication faults
  • Valves or throttle bodies coked up with carbon

We don’t guess. We check and verify before we replace any parts.


Our Diagnostic Process

When you drive in, we:

  • complete ECM scan
  • Frozen frame data (fault type identified during the time of occurrence) viewing
  • Visual inspection under the hood
  • Real time monitoring on the important sensors
  • Smoke testing (or pressure testing if required)
  • Systematic assessment of the suspicious components
  • Road test to replicate symptoms
  • Written proposal with explanation of findings

You will receive real answers — not just a series of error codes.


Beyond the Check Engine Light

Many such drivability issues don’t set a warning light but are serious enough to affect performance. We help diagnose issues like:

  • Jerky acceleration
  • Engine surging
  • Long crank/start times
  • Reduced throttle response
  • Unusual engine sounds

If something doesn’t seem right, you can trust your instincts and we’ll look closer.

Person working on a car engine; hands adjusting parts, dark clothing, outdoor setting.
Blue SUV in a grassy field at sunrise, person in background.

Advanced Tools and Training

We use professional-grade scan tools and software — not the limited readers you’ll find at chain stores. Our technicians are trained to:

  • Interpret fault codes properly
  • Understand system interactions and component dependencies
  • Perform bidirectional testing (commanding systems on and off)
  • Follow factory flow charts and procedures
  • Confirm root cause before quoting repairs

This precision helps avoid guesswork and prevents unnecessary costs.


Why Drivers in Addison Trust Us

  • Fast and accurate diagnostics
  • Upfront, honest pricing and clear communication
  • Repairs completed in-house
  • ASE-certified techs with decades of experience
  • Local shop with a reputation for fair, transparent service

We’re not here to sell you parts you don’t need. We’re here to fix the problem right the first time.


Conveniently Located in Addison

  • Address: 16288 Midway Rd, Addison, TX 75001
  • Phone: (972) 468-0600
  • Website: https://addison.eagletransmission.com
  • Google Maps: https://www.google.com/maps?q=Eagle+Transmission+Addison+TX
  • Hours: Monday – Friday, 8:00 AM – 5:00 PM