Engine Diagnostics in Boulder County
Welcome to John's Auto Care - Your Trusted Auto Repair Shop and Engine Diagnostic Expert
If your vehicle is experiencing rough idling, hesitation, strange noises, or a sudden drop in performance, it could indicate underlying engine problems. At John’s Auto Care, we specialize in professional engine diagnostics to accurately identify and resolve issues, getting you back on the road with confidence.
Signs You Need an Engine Diagnostic Service:
- Check Engine Light On - If your check engine light is illuminated, don’t ignore it! It could indicate anything from a loose gas cap to a critical engine problem.
- Decreased Performance - Loss of power, rough idling, or hesitation when accelerating are signs of underlying engine issues.
- Unusual Noises or Vibrations - Knocking, rattling, or excessive vibrations may indicate internal engine concerns.
- Poor Fuel Efficiency - A sudden drop in gas mileage could mean your engine is not running optimally.
- Excessive Exhaust Smoke - White, blue, or black smoke from the exhaust could be a sign of fuel, oil, or coolant issues.
Comprehensive Engine Diagnostics
With cutting-edge diagnostic tools our certified technicians will delve deep into your vehicle's systems and provide a comprehensive analysis of the problem as well as report on the overall health of your vehicle.
Why Choose John’s Auto Care for Your Engine Diagnostics?
- Experienced Mechanics: Our ASE-certified mechanics have the expertise to diagnose and repair all engine-related issues, ensuring you receive accurate and reliable service every time.
- Advanced Diagnostics for Precise Repairs: Our state-of-the-art diagnostic technology enables us to accurately identify even the most intermittent and difficult problem your vehicle may be experiencing.
- Quality Parts: We use high-quality components that meet or exceed industry standards. Our commitment to quality means long-lasting solutions for your vehicle.
- Nationwide Warranty Protection for Peace of Mind: Wherever the road takes you, our repairs are backed by a 3-year/36,000-mile nationwide warranty. That means you can have confidence knowing that if an issue arises, you're covered—whether you're here in town or miles away
Willing To Earn Your Trust
At John’s Auto Care, we know that finding a trustworthy auto repair shop can be challenging. That’s why we are committed to honesty, quality workmanship, and customer satisfaction. From the moment you walk through our doors, you’ll experience friendly service, transparent recommendations, and repairs you can rely on. We take pride in earning your trust—one service at a time.

- Transparent Pricing & Communication: We believe in clear, upfront pricing with no hidden fees. You’ll always know what to expect before we begin any work on your vehicle.
- Fast, Reliable Service: We know how important it is to get your vehicle back on the road as soon as possible. Our team works efficiently to diagnose and resolve your engine issues with minimal downtime.
- Free Shuttle and Loaner Cars: We understand how disruptive it can be to get your vehicle in for service or repairs. That's why we offer a free shuttle service to get you to and from home or work with ease. For repairs that require multiple days, we also provide loaner cars (with proper ID and insurance) to ensure you never miss a beat.
- Locally Owned & Customer-Focused: As a locally owned and operated shop, we have served our community with honesty and integrity for over 20 years. Our team is always here to help with your engine diagnostic needs.
Schedule Your Engine Diagnostic Service Today
Don’t let engine trouble leave you stranded. If your check engine light is on or you’re experiencing performance issues, trust the experts at John’s Auto Care. Contact us today to schedule an engine diagnostic service.