8608 North State Road 19, Etna Green, IN 46524

Automotive Repair in Etna Green, IN

Vehicles at Mast Service Center for auto repair services.


While Mast Service Center first opened in 2005, Leonard Mast was working on diesels on his father’s farm since he was 13 or 14 years old. He went into trucking, then decided to build an auto repair shop. The shop has several technicians who work on anything from a Ford Escort to fleets of big rigs. Each mechanic has one or more certifications, including ASE Certification, Hunter Certification and air brake certifications. The shop is also a NAPA auto care truck center.

If you need vehicle service and repair, or you have a fleet that needs service and repair, contact Mast Service Center for an appointment today.

Service and Repair in Etna Green, IN

Our auto repair shop in Etna Green IN welcomes all types of vehicles, including daily drivers, diesel trucks, big rigs, RVs, buses and more. We have the equipment to diagnose and repair just about anything.

Some common repairs we see at Mast Service Center include:

  • Radiators, thermostats and hoses.
  • Head gaskets.
  • Timing chains and timing belts.
  • Sensors and control modules.
  • Fuel pumps.
  • Water pumps.
  • Power steering pumps, racks and gearboxes.
  • Suspension, including shocks, struts, bushings and springs.
  • Wheels and tires.
  • The brake system.
  • Heating and air conditioning.
  • Air brakes.
  • Tune-ups.
  • Fuel injection systems and carburetors.
  • Coils, plugs, wires, coil packs and coil-on-plug.
  • Flywheels and flexplates.
  • Automatic and manual transmissions.
  • Exhaust systems.
  • CV Axles.

We also provide maintenance for cars, trucks, buses, RVs, big rigs and fleet vehicles. Our services include:

  • Oil and filter changes.
  • Tune-ups.
  • Alignments, including RV alignments.
  • Balance and rotate tires.
  • Brakes CV boots.
  • Transmission service and filter change.
  • Transmission flush.
  • Coolant flush.
  • Power steering fluid flush.
  • Brake fluid flush.
  • Fuel filter replacement.
  • Cabin air filter replacement.
  • Engine air filter replacement.

Electrical Services

At Mast Service Center, we have diagnostic tools for electrical problems. We diagnose and repair electrical issues, including those that others cannot find. With up to a mile’s worth of wiring in some vehicles, it can be difficult to find a problem, but our electrical mechanic has the experience to locate hard-to-find issues.

Sensors and Control Modules

When your vehicle’s check engine light comes on, you have a problem with the engine management system. Your vehicle might not run at all, or it could run poorly. In some cases, you might not even notice a difference.

However, any problem that causes the check engine light to come is something that should be checked out immediately. If the vehicle still runs, but runs poorly, it is probably in limp-home mode. In most cases, it will run until you shut it off. The computer allows this so that you can get to a shop or home instead of being stranded on the road.

We have the equipment to pull the codes and future diagnose the issue. Just because an engine throws a code, that doesn’t mean the sensor itself is bad. For example, an oxygen sensor sends a code if the vehicle is running too lean or too rich – the oxygen sensor is most likely not bad. We’ll diagnose the reason the oxygen sensor is showing out of range.

In other cases, such as a MAP or MAF sensor or a throttle position sensor, it is more likely that the sensor is bad.

Diagnosing engine control modules and sensors is often difficult unless you have the proper equipment. At Mast Service Center, we have the scanners and diagnostic equipment needed to properly diagnose the sensors and control modules.

Fleet Services

We understand that having a fleet vehicle down affects your bottom line. We strive to be fast without compromising quality. We have several technicians who are ready to work on your fleet vehicle on the fleet side of our auto repair shop.

Some of the repairs we have seen in our shop include:

  • Head gaskets.
  • Air brake system repairs.
  • Radiators, hoses, fans and thermostats.
  • Exhaust systems.
  • Suspension and steering, including gearboxes, bushings, springs, struts and shocks.
  • Brakes, including pads, rotors, shoes, drums, calipers, wheel cylinders and brake lines.
  • Fuel injection.
  • Sensors and control modules.
  • Wheels and tires.
  • Wheel alignments.

We also provide maintenance for fleets. Contact the shop to discuss scheduling, including the best time or days to bring your fleet vehicles in. We’ll get your fleet vehicles serviced as quickly as possible. Our maintenance services include:

  • Oil and filter changes.
  • Automatic transmission service, filter change, and fluid flush.
  • Tune-ups.
  • Brake services.
  • Coolant flushes.
  • Flush and replace the brake fluid.
  • Flush and replace the power steering fluid.
  • Replace engine air filters.
  • Replace cabin air filters.
  • Replace fuel filters.

Trailer Repairs

When your trailer is down, you miss delivery deadlines. We not only repair big rigs, but we also repair trailers. Trailer repairs include:

  • Air brakes.
  • Brake lines.
  • Barn doors, rollup doors and loading ramps.
  • Box trailer skins.
  • Trailer suspension.
  • Electrical and lights.
  • Landing gear.
  • Equalizers.

Whether you have a reefer, box trailer, low-boy, flatbed, tank, car hauler or other kind of trailer, we will repair it for you. Contact the shop to discuss your needs.

We’ll diagnose the problem and get you back on the road as soon as we can without sacrificing quality.

Service Areas

While many of our customers are from nearby, we also provide service and repairs for fleet vehicles on the road who need emergency services, and for RVs who are also on the road and need emergency services.

We service Elkhart, Goshen, Breemin, Walker, New Paris, South Bend, Bourbon, Wappanee, Plymouth, Warsaw, and Etna Green. Visit us or contact us to make an appointment for service and repairs, including electrical problems, exhaust issues, suspension issues, heating and air conditioning, major engine repair and more.


Our auto repair shop is a professional shop. We use OE scan tools to diagnose your vehicles. We also have a comfortable place for you to wait if you are waiting for your vehicle.

Our technicians have several certifications, including ASE Certifications, Hunter Certifications and air brake certifications. We are also a NAPA auto care truck center.


Because we stand behind our work and pride ourselves with getting it done right the first time, we offer warranties. Work on fleet vehicles have a 12-month, 12,000-mile warranty. Work on other vehicles has a 24-month, 24,000-mile warranty.