Diag4 Bike Serial Diagnostic System Adaptor Cable - Harley 2021+ Adapter Cable — Harley-Davidson (2021)

Diag4 Bike serial diagnostic system adaptor cable for V-twin motorcycles, connecting your Harley or Indian to a Windows PC for engine diagnostics and parameter monitoring. USB connection with software compatibility from Windows XP through Windows 10.

Features

• USB connection to PC or laptop
• Windows XP, Vista, 7, 8, and 10 compatible
• 7-inch cable length

Specifications

• Brand: Diag4 Bike
• Manufacturer Part #: AT 531 4049
• Length: 7 in
• Weight: 1.2231 lbs
• Country of Origin: Czech Republic

Fitment

Fits V-twin motorcycles including Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

What does this cable do?

Connects your V-twin motorcycle to a Windows PC to read and monitor engine diagnostics, fault codes, and system parameters using Diag4 Bike software.

Will this work on my Windows 11 or newer PC?

This cable is certified for Windows XP through Windows 10. Compatibility with Windows 11 or newer is not listed — contact Diag4 Bike before ordering if you run a newer OS.

Does this fit both Harley and Indian motorcycles?

Yes — this adaptor is designed for V-twin motorcycles, including both Harley-Davidson and Indian Motorcycle brands.

What's included in the box?

The serial diagnostic adaptor cable. You will need to source or download the Diag4 Bike software separately.