Tough Knuckles Automotive
Engine Diagnostics in Holland, OH
The check-engine light means the car's computer saw something it did not like. The light alone does not tell you the fix. A code is a starting point, not an answer.
The check-engine light means the car's computer saw something it did not like. The light alone does not tell you the fix. A code is a starting point, not an answer.
We pull the codes, then test the actual parts to see what is really wrong. That keeps you from buying a sensor when the true problem is a hose or a spark plug. You get a free estimate once we know.
Know the signs
Signs you might notice
- The check-engine light is on, flashing, or comes and goes.
- The engine idles rough or shakes at a stop light.
- The car feels slow to speed up or stumbles when you press the gas.
- Your gas mileage has dropped for no clear reason.
- You smell rotten eggs or raw fuel from the exhaust.
- The engine sputters, misfires, or nearly stalls.
What's behind it
Common causes
- Worn spark plugs or ignition coils that cause a misfire.
- A bad oxygen sensor or air-flow sensor sending wrong readings.
- A loose or cracked gas cap or a leak in a vacuum hose.
- A clogged fuel injector or a weak fuel pump.
- A stuck valve or a worn timing part on higher-mileage engines.
How it works
How we handle it
You bring the car in and tell us how it drives and when the light came on.
We connect a scan tool and record every code, plus the live data the engine is reporting.
We test the parts the codes point to, checking spark, fuel, air, and compression as needed.
We confirm the cause, then give you a written estimate for the repair.
What we check
- Stored and pending trouble codes and the freeze-frame data.
- Spark plugs, coils, and wires for wear and misfire.
- Fuel pressure and how the injectors are working.
- The air intake and vacuum lines for leaks.
- Live sensor readings against what the engine should show.
Why this matters
A small engine fault often grows. A single misfire can dump raw fuel into the exhaust and ruin the catalytic converter, which is a costly part. A flashing light means damage may be happening right now. Finding the cause early keeps a minor repair from becoming a major one.
Frequently asked questions
Is a solid check-engine light an emergency?
Can't the parts store code reader tell me the fix?
Can I keep driving with the light on?
How long does a diagnosis take?
Do repairs come with a warranty?
Do I have to bring it to your shop?
Reviews
Engine Diagnostics customers, in their words
"Reasonable price. Did a wonderful job on putting a starter on the truck. They are very pleasant people to talk with and very helpful."
"These people are super legit - I normally don't leave reviews but Corey and Ashley did me such a huge service fixing my..."
"Great price. Cory is an amazing mechanic and handled my fiancée's car with care! Him and his wife are super nice and super friendly...."
Visit the Shop
Where to Bring Your Car for Engine Diagnostics
All work is done at our shop. Drop-off is easy, and there's a key drop for early or after-hours.
- Address
- Address 932 Holland Park Blvd
Holland, OH 43528 - Hours
- Hours Monday-Friday, 9 AM-6 PM
Closed weekends
Drop-off shop in Holland. Call first and we will help you plan the visit.
Ready when you are
Tell Us What Your Car Is Doing
We will test it, give you a free estimate, and only start once you say go. No pressure, no jargon.
Not sure what it needs? That is okay. Describe the symptoms and we will help you figure out the next step.
30+ years of automotive experience · Family-owned · Free estimates · 15% military discount