Engine Diagnostics & Repair

Professional Engine Diagnostics & Repairin Tecumseh, OK

A check engine light, rough idle, or crank with no start—every symptom is your vehicle’s way of asking for help. At Miller Brothers Automotive, we don’t jump to conclusions. We listen, investigate, and communicate every step with clarity. Our team uses advanced diagnostics and years of hands-on experience to deliver accurate, lasting repairs. You’ll leave confident the job was done right, and that you were heard along the way.

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What Is Your Engine Trying to Tell You?

Today’s vehicles are smart. But when something’s off under the hood, they don’t always explain it clearly, they flash a warning light and leave you guessing.

Here are a few common red flags Tecumseh drivers bring to us:

These symptoms can point to deeper issues with your ignition system, fuel delivery, electrical components, cooling system, or even something as simple as a loose electrical connection.

Either way, we’ll take the time to track down the root cause, explain what’s happening, and outline your repair options.

Our Complete Engine Diagnostic & Repair Services

We use OEM-level programming tools including Snap-On diagnostic scanners and modern engine test equipment to inspect every system connected to your vehicle’s performance.

Check Engine Light Diagnosis

When your check engine light appears, we don’t just plug in and guess. Our team scans your system, interprets the codes, verifies the problem, and performs the testing necessary to find the root cause of the concern—so you know exactly what’s going on and what comes next.

Misfire Diagnostic & Repair

Misfires can cause jerking, power loss, poor fuel economy, and even long-term engine damage. We test coil packs, spark plugs, injectors, and compression levels to pinpoint the exact cause and correct it for a smooth, reliable drive.

Engine Tune-Ups & Spark Plug Replacement

A proper tune-up can make your vehicle feel new again. We replace worn spark plugs, test ignition components, replace filters, and calibrate performance to maximize fuel efficiency and reduce emissions.

Starting & Charging System Repairs

If your engine cranks slowly or not at all, the problem might lie in your starter, alternator, battery, or wiring. We diagnose the full system and perform precise repairs or replacements to get your engine starting strong.

Battery Light Diagnosis & Battery Replacement

A battery warning light can mean more than a weak battery. It may signal an alternator issue, voltage drop, or faulty ground. We test the full charging system and replace your battery using dependable, long-lasting brands when needed.

Cooling System & Radiator Repairs

An overheating engine is one of the fastest ways to cause major damage. We inspect and service the radiator, water pump, thermostat, cooling fans, and all related hoses to keep your engine running at a safe, steady temperature.

Fuel System Inspections & Repairs

Whether your engine is running lean, sputtering, or struggling at startup, the fuel system might be to blame. We inspect fuel pumps, pressure regulators, injectors, and lines—cleaning or replacing components to restore power and responsiveness.

Gasket, Seal & Minor Engine Repairs

We address common engine leaks and failures, like valve cover gaskets, timing covers, oil pans, and cam seals to protect your engine from fluid loss and future wear. Small repairs now can prevent major repairs later.

Engine Replacement

When an engine is beyond repair or no longer cost-effective to fix, we offer full engine replacements with high-quality parts, expert installation, and a warranty you can trust. We’ll guide you through every option, cost, and timeline.

Big on Accuracy. Bigger on Integrity.

Engine trouble is personal. That’s why we treat every repair like it’s for the family—with clear updates, expert care, and no guesswork.

Certified, Trusted Technicians

With ASE Master and L1 Advanced certifications, our team brings serious know-how to every engine repair.

Tools That Match Our Expertise

From check engine lights to no-start conditions, we use dealership-grade tools to find the problem and fix it right.

We Talk to You—Not Around You

No cryptic explanations here. We provide daily updates and explain each step so you always know what to expect.

Quick, Clean, Professional Service

We focus on timely, high-quality service to get your engine back in shape without delays or surprises.

Warranty You Can Count On

Our engine repairs come with a 2-year/24,000-mile warranty because doing it right the first time is our standard.

Engine Trouble? Let’s Get You Back on the Road

Whether it’s overheating, stalling, or just “not quite right,” drivers in Tecumseh, Shawnee, McLoud, Macomb, and Seminole trust Miller Brothers Automotive for fast, honest auto repairs.

Come by 201 E Walnut Street, Tecumseh, OK 74873, call (405) 598-0220, or book online. We’ll get your engine—and your day—back on track.