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.
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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.