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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.

Call (419) 392-5926 Get a Quote

Diagnosis: $75, credited to your repair · Done at our Holland shop

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 firm price 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.

This is a general guide, not a diagnosis or repair quote. We need to inspect your car to confirm the problem and price.

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

1

You bring the car in and tell us how it drives and when the light came on.

2

We connect a scan tool and record every code, plus the live data the engine is reporting.

3

We test the parts the codes point to, checking spark, fuel, air, and compression as needed.

4

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.

Your next step

Get it tested before it gets worse

Call us with the year, make, and model and what the car is doing. We will set a drop-off time at our Holland shop, test it, and call you with a firm price before any work starts.

Diagnosis: $75. If you have us do the repair, we credit that fee toward your final bill. You get the price before any work starts.

Call (419) 392-5926 Request service

Frequently asked questions

Is a solid check-engine light an emergency?
Usually not right away, but do not ignore it. Get it read soon. A flashing light is more serious and means you should drive gently and come in fast.
Can't the parts store code reader tell me the fix?
It gives a code, which is only a clue. The same code can have several causes. We test the parts to find the real one so you do not waste money.
Can I keep driving with the light on?
If the car runs and drives normally and the light is steady, short trips are usually okay until your appointment. If it shakes, loses power, or the light blinks, bring it in right away.
How long does a diagnosis take?
Many are done in an hour or two. A hard-to-find or come-and-go fault can take longer. We keep you posted.
Do repairs come with a warranty?
The parts we install are covered by the maker's warranty. Ask us for the details that apply to your repair.
Do I have to bring it to your shop?
Yes. All testing happens at 932 Holland Park Blvd in Holland, Ohio. We do not offer mobile diagnostics.

Reviews

Engine Diagnostics customers, in their words

5.0/5 · 3 Google reviews
Read all on Google
"Reasonable price. Did a wonderful job on putting a starter on the truck. They are very pleasant people to talk with and very helpful."
Heather MillsJuly 2026 · Google
"These people are super legit - I normally don't leave reviews but Corey and Ashley did me such a huge service fixing my..."
xMorlockJuly 2026 · Google
"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...."
Alex NomichitMay 2026 · Google

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
Get Directions Call (419) 392-5926

Drop-off shop in Holland. Call first and we will help you plan the visit.

Tough Knuckles Automotive location

932 Holland Park Blvd, Holland, OH 43528

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Ready when you are

Tell Us What Your Car Is Doing

We will test it, give you a straight price, 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.

Get a Quote Call (419) 392-5926

30+ years of automotive experience · Family-owned and woman-owned · 15% military discount on labor

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