909 N Main St, O’Fallon, MO 63366

Welcome to Len’s Auto Repair! March 1974 marked the humble beginnings of Leonard & Shirley Mertz’s enduring legacy. With determination, Leonard embarked on his journey alongside his wife transforming an aging three bay gas station in Overland into the thriving establishment it is today. For 32 years, Leonard toiled tirelessly, dedicating himself to the persuit of excellence in auto repair and providing honest and realiable service. Through both of their efforts, they established a formidable reputation for delivering top-notch automotive car and fostering customer satisfaction.

Today, Len’s Auto Repair has 3 locations located in Overland, Cottleville, and O’Fallon. We are here to help, don’t hesitate to reach out!

Happy Customers.
Great Reviews.
Thank you.


I have had work done twice at the O’Fallon location. Great service each time with good prices. All service is done as promised in a timely manner, and they provide excellent communication regarding all suggested work prior to it being done. I highly recommend Len’s.

– Tim P.


I could never recommend Len’s enough!! My grandparents and parents have always taken their cars to Lens and I totally understand why. Mat did an INCREDIBLE job completely replacing the engine on my Jeep & went above and beyond to make sure I got it back in perfect condition.

– Megan F.

Auto Repair in O’Fallon


With over 40 years of unwavering commitment to excellence, our auto repair business stands as a trusted pillar in the industry. Since our establishment, we have been dedicated to providing top-notch service, superior craftsmanship, and unparalleled customer satisfaction.

Our extensive experience has honed our skills and deepened our understanding of automotive systems, allowing us to diagnose and fix even the most complex issues with precision and efficiency. We have witnessed the evolution of automotive technology and have adapted our practices to stay ahead of the curve, ensuring that we can address the needs of modern vehicles with ease.

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Proudly Serving St. Charles County

909 N Main St
O’Fallon, MO 63366
Phone: 636-474-1710
Email: ofallon@lensauto.net
Text: 636-206-7928

Hours of Operation

Sunday: Closed
Monday: 8:00-5:00
Tuesday: 8:00-5:00
Wednesday: 8:00-5:00
Thursday: 8:00-5:00
Friday: 8:00-5:00
Saturday: Closed

  • Full Automotive Repair
  • Mechanical Repair
  • Wheel Alignments
  • Tire Rotation and Balancing
  • Oil Changes and Filter Replacements
  • Brake Inspection and Repair
  • Brake Fluid Flush
  • ABS System Diagnosis and Repair
  • Engine Diagnostics
  • Tune-ups / Spark Plug Replacement
  • Timing Belt/Chain Replacement
  • Engine Repair and Replacement
  • Transmission Fluid Flush
  • Transmission Repair and Replacement
  • Clutch Replacement
  • Gearbox Inspection and Repair
  • Battery Testing and Replacement
  • Alternator Repair and Replacement
  • Starter Repair and Replacement
  • Wiring and Electrical Diag and Repair
  • HVAC System Inspection andRepair
  • Heater Core Repair and Replacement
  • Suspension and Steering Repair
  • Fuel System Cleaning