Diesel Repair Shop Serving Monroe, WA

Monroe's diesel trucks work hard, and when something goes wrong, you need a diesel mechanic who knows your engine. FS Autoworx is the premier diesel repair shop in Monroe, WA, built by certified technicians with nearly 20 years of industry experience and a reputation for getting it right the first time.

Powerstroke, Cummins, and Duramax Repair in Monroe, WA

Ford Powerstroke, Ram Cummins, and GM Duramax engines each have their own quirks, and not every shop knows how to handle them. Our technicians specialize in diesel truck repair across all three platforms: fuel system diagnostics, injector service, glow plug replacement, EGR cleaning and repair, DPF service, and complete engine overhauls. Whether your 6.7 Powerstroke is throwing codes or your Duramax is losing power, we diagnose the root cause before turning a wrench.

Diesel Services We Provide

Our diesel repair shop handles the full range of diesel-specific work Monroe drivers need:

Diesel engine diagnostics: We use advanced scan tools to read diesel-specific fault codes and pinpoint issues fast, so you are not guessing at a repair bill.

Fuel system service: Diesel injectors, lift pumps, CP3 and CP4 high-pressure fuel pumps, and fuel filters serviced to factory spec.

EGR and DPF service: Clogged EGR coolers and plugged DPF filters kill performance and fuel economy. We clean, repair, or replace them with parts that last.

Turbocharger repair: Variable-geometry turbos, wastegate actuators, and full turbo replacements performed in-house.

Diesel tune-ups: Filters, fluids, belts, and preventative maintenance to keep your truck running for the long haul.

Why Monroe Diesel Drivers Choose FS Autoworx

FS Autoworx is a family-owned shop right on State Route 2 in Monroe. Certified technicians, all work fully warranted, and upfront estimates before any job starts. Customers drive from Snohomish, Sultan, and even Seattle because the quality is worth the trip. We treat your truck like it is our own, and we keep you informed every step of the way.

Explore our full range of automotive repair services or check out our performance upgrades if you are looking to get more out of your diesel.

Frequently Asked Questions

  • We work on all diesel trucks, with deep experience in Ford Powerstroke (6.0, 6.4, 6.7), Ram Cummins (5.9, 6.7), and GM Duramax (LB7 through L5P) engines. Import and medium-duty diesels are welcome too.

  • Yes. EGR cooler failure and DPF clogging are among the most common diesel issues we see in Monroe. We diagnose, clean, repair, or replace these components and clear related fault codes.

  • Yes. We rebuild and replace turbos in-house, including variable-geometry units on Powerstroke and Duramax applications. Call (360) 548-3491 to describe your symptoms and we will let you know what to expect.

  • Most diagnostic appointments are same-day. Repair timelines depend on parts availability and job scope. We give you a written estimate and timeline before any work begins so there are no surprises.

  • Yes. Our technicians are certified with nearly 20 years of professional automotive and diesel experience. All repair work is fully warranted.

Ready to Bring Your Diesel Truck In?
Stop guessing and get a straight answer from a diesel mechanic who knows your engine. FS Autoworx is located at 18970 State Route 2, Monroe, WA 98272, open Monday through Friday, 8 AM to 5 PM. Call us at (360) 548-3491, book online, or find us on Google Maps for directions. Monroe's premier diesel repair shop is ready when you are.