Auto Repair Services

Hartford, WI | Erin, WI

12-Month/24,000-Mile Warranty on All Auto Repairs

We Work With All Insurance and Aftermarket Warranty Companies

Carfax Top-Rated Dealer

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Reliable Auto Repair Services in Hartford

When your car or truck breaks down, you need a shop that will fix it right the first time. M&J Auto Sales & Service has been helping drivers in Hartford, WI since 2009. Our team brings more than 75 years of combined experience and holds ASE certifications. We give you honest answers and reliable repairs every time.

Our family owns and operates this business, and we have built our reputation on quality work and clear communication. We back every repair with a 12-month/24,000-mile on all auto repairs nationwide warranty on parts and labor. Call us today to schedule your service appointment.

Why Choose Us

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ASE Certified Technicians

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Quality Service

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Great Reputation

M&J Auto Sales & Service
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12-Month/24,000-Mile Warranty

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Works With All Insurance and Aftermarket Warranty Companies

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CARFAX Top-Rated Dealer

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Air Conditioning Service & Repair

Stay comfortable during hot weather with our complete AC service. We repair and maintain your vehicle's climate control system to keep the cool air flowing.
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Alternator & Starter Repair

We find and fix problems with your alternator and starter so your vehicle fires up reliably every time you turn the key.
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Professional Auto Diagnostics

Our modern diagnostic tools identify the real problem with your vehicle. This accuracy helps you avoid paying for repairs you don't need.
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Battery Replacement Services

A dead battery can leave you stranded. We test your battery's health and install a quality replacement when needed.
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Belts & Hoses

Regular inspection and replacement of worn belts and hoses helps prevent unexpected breakdowns on the road.
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Brake Service & Repair

Your safety relies on brakes that work properly. We handle pad replacement, rotor resurfacing, and complete brake system repairs.
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Car Radiator Service

Your engine needs to stay at the right temperature. We repair radiators and service cooling systems to prevent overheating.
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Check Engine Light Services

When your check engine light comes on, we read the diagnostic codes and repair the underlying problem causing the warning.
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Steering & Suspension

Worn steering and suspension parts affect how your vehicle handles. We repair and replace these components to restore a smooth, safe ride. You can rely on our experienced team for auto repair in Hartford, WI and beyond.

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Transmission Repair Service

Whether you need routine transmission service or major repairs, our experienced technicians will keep your gears shifting the way they should.

Our Recent Projects

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Here's what our satisfied customers are saying...

At M&J Auto Sales & Service, we take pride in providing exceptional auto services to our customers. We would be grateful if you could share your thoughts about our business with others. Your feedback helps us improve and helps others make informed decisions. Please take a moment to leave a review of M&J Auto Sales & Service and let others know what you think.

  • How does your team determine which components need attention during an inspection?

    Our process begins with an exhaustive visual and physical evaluation of your vehicle's major mechanical systems. We check for fluid leaks, unusual component wear, and structural integrity to catch small issues before they turn into major breakdowns. By pairing this hands-on evaluation with advanced scanning equipment, we precisely pinpoint hidden malfunctions without any guesswork. This detailed method allows us to provide a definitive strategy for your auto repair in Hartford, WI so you can plan accordingly. We outline exactly what needs immediate attention and what can wait, ensuring you always feel fully informed about the physical condition of your car or truck.

  • What steps do you take to guarantee that a vehicle is safe for the road after a complex service?

    Safety is built directly into our operational workflow from the moment a vehicle enters our service bay. Once our technicians complete a mechanical fix, a secondary assessment is conducted to verify that all parts are properly seated and calibrated. We perform comprehensive road tests under real-world driving conditions to confirm that your systems respond correctly and smoothly. This rigorous quality check is central to our approach for auto repair in Hartford, WI because we know your family relies on a secure vehicle. We never return a car until we are entirely satisfied that it meets our strict operational safety standards.

  • How do your technicians handle unexpected mechanical findings during a pre-scheduled service?

    If we discover additional wear or an unrelated mechanical fault while working on your vehicle, we stop and document the issue immediately. We take the time to photograph or clearly map out the problem so we can share those details directly with you. Our team will contact you to explain the situation, offer practical choices, and provide a comprehensive update on any necessary parts or labor costs. When it comes to managing auto repair in Hartford, WI, we strictly believe that the customer retains final authority over all work. We never perform unauthorized fixes or add unexpected fees to your final invoice.

  • What kind of long-term value do local vehicle owners receive by partnering with your shop?

    Our primary focus centers on extending the total operational lifespan of your vehicle through precise, high-quality mechanical work. By addressing small fluid updates, belt replacements, and component adjustments early on, we help you avoid catastrophic engine or drivetrain failures down the road. This proactive stance saves you significant amounts of money over time and helps protect the overall resale value of your asset. Investing in dependable auto repair in Hartford, WI ensures that you enjoy consistent vehicle performance and minimizes the risk of sudden roadside emergencies.

  • How does your team stay current with evolving automotive technologies and vehicle platforms?

    The automotive industry changes rapidly, with modern cars relying heavily on intricate computer networks, advanced electrical systems, and specialized mechanical designs. Our technicians commit to ongoing professional development and technical training to stay ahead of these complex engineering shifts. This continuous education allows us to service older traditional models and modern vehicle platforms with equal precision and efficiency. Our shop invests heavily in matching this knowledge with updated diagnostic equipment designed for auto repair in Hartford, WI.

  • What should a customer look for when evaluating the overall health of their vehicle between visits?

    We encourage drivers to remain attentive to subtle changes in how their vehicle behaves during regular daily commutes. You should watch out for new vibrations in the steering wheel, soft pedal feedback when braking, or unusual fluid spots on your driveway. Paying close attention to strange grinding noises, ticking sounds, or sluggish shifting can also alert you to an emerging mechanical issue. Catching these warning signs early and bringing your vehicle in for auto repair in Hartford, WI prevents minor component wear from cascading into severe damage.