Skip the $500–$1,000 dealer diagnostic. Start free with service reminders, DTC codes, torque specs and bike-specific specs — then let a simple symptom-based Q&A point you to the probable failed part. Built for 2007–2017 Delphi EFI Harley-Davidson motorcycles. No scanner hardware required.
The standard dealer ecosystem — tow, scan fee, first hour of shop labor — adds up before anyone has actually fixed anything.
Flatbed motorcycle tow runs $100–$300 before anyone even looks at your bike.
Service departments book out fast, especially in riding season. Expect days to weeks on the lift waitlist.
Once they get to it, the diagnostic fee runs $50–$100+ just to identify the problem.
Shop labor runs $100–$200 per hour plus parts — and that's before anything actually gets repaired.
Free tools every Harley owner should have. Free registration. Always in your pocket.
Free maintenance reminders matched to your exact bike and mileage — so you never miss a service interval again.
71 diagnostic trouble codes in plain English, each with the probable causes behind the code — no scan tool needed.
119 torque specs organized by system — Twin Cam and Sportster Evo engines plus per-platform chassis fasteners.
Factory-recommended maintenance schedules linked to your motorcycle's mileage.
Electrical and mechanical specifications for your exact year, model, and engine — battery, charging, ignition and more.
Register your bike in a free garage profile with service records and notes. Add up to 3 bikes with Premium.
Maintenance reminders matched to your exact Harley — your model, your mileage, what you've already done — so an oil, primary, or transmission service never slips by again. Download the app, register your bike, and it's yours: locked in free on your account.
The full diagnostic toolkit your mechanic uses. 3 days free. Then $9.99/month, cancel anytime.
12 symptom-based Q&A decision trees: answer plain questions about what your bike is doing and the app correlates those behaviors to the probable component failure — the way a seasoned tech reasons it out.
49 component cards showing the actual part behind each probable cause — what it is, where it lives, and what it does — so you know exactly what you're looking at.
Detailed diagrams for all 12 EFI and mechanical systems — ignition, fuel, starter, sensors, security, ECM power, brakes, wheels, suspension, steering, drivetrain, and leaks & noises.
Comprehensive Delphi EFI health assessment with pass/fail tracking and PDF export.
Expand your free garage to 3 motorcycle profiles with full specs and service history — and swap bikes as your stable changes.
Generate branded, sharable diagnostic reports with circuit diagrams, findings, and probable causes.
Save and review every completed diagnostic over time on each bike in your garage.
Riding tips, mechanical primers, and Delphi EFI deep-dives.
Know a Harley owner whose bike is down? Send them V-Twin Diagnostics and save them the tow, the wait, and the dealer scan fee.
Share Now →Built specifically for Harley-Davidson motorcycles with Delphi Electronic Fuel Injection (2007–2017).
Twin Cam 96 / 96B / 103 / 103B / 110 and Evolution Sportster 883 / 1200 engines.
We narrow on purpose so the depth is right. Pre-2007 carbureted bikes, Magneti Marelli EFI Tourings, V-Rod, and Milwaukee-Eight platforms are not in scope. Coverage will expand in future versions.
Choose your year, model family, sub-model, and engine. The app tailors diagnostics to your specific bike.
Pick from categories like "Won't Start," "Runs Rough," "Electrical Issue," or "Brake/Suspension" to begin.
Answer simple yes/no questions. The app narrows down the cause step by step with pro tips along the way.
Receive a clear finding with the probable cause, the component card for the part behind it, related DTCs, and the circuit diagram. When it's genuinely ambiguous, the app says so and points you to your dealer — no guessing.
Save results to your garage profile, generate a PDF report, or start a new diagnostic — all from one screen.
Download V-Twin Diagnostics. Free tools forever. Premium 3 days free. No scanner hardware to buy.
3 days free, then $9.99/month. Cancel anytime. One successful at-home diagnosis pays for the app for the better part of three years.
Download V-Twin Diagnostics, register your bike, and the Smart Service Scheduler is included — free maintenance reminders matched to your exact model and mileage, locked in on your account.
Coming Soon to the App Store Coming Soon to Google PlayFree to download. Free registration. The Smart Service Scheduler and all reference tools are included at no charge.