Serving Rapid City, SD and the Surrounding Areas

RNJ Auto Inc - Logo Auto repair Auto Diagnostic Auto diagnostic

Enjoy the latest in diagnostic services

You know that uneasy feeling you get when your vehicle's check engine light comes on. Count on the professionals at RNJ Auto Inc to properly diagnose the problem with your car or truck.

  • Cruise control

  • Body control

  • Air bags

  • Anti-lock systems

Diagnose your car's problems

Allow us to diagnose issues with all the major systems of your vehicle. We'll keep your car safely moving down the road. Bring your vehicle to us for a FREE estimate and senior citizen and military discounts. We carry the parts you need.

Discover the issues with your car

Get low labor rates on your car repairs. Call us today.


Connect with a family owned and operated business serving the area for 6 years.