The only hardware you need costs about $10.
VQLab connects through a standard USB K-line (KKL) cable. No boards to fit, no ECU to open. Here's exactly what to buy.
VAG 409.1 KKL USB cable
A generic OBD2-to-USB K-line cable, sold under names like "VAG-COM 409.1 KKL". It's the type we use on our own Fuga 450GT. It's cheap, easy to find, and needs no extra hardware.
- Type
- Dumb K-line (KKL)
- Chip
- CH340 only
- Port
- USB → COM port
- Price
- ~NZ$10–40
Where to buy
Links open a marketplace search, as individual listings change often. VQLab doesn't sell or endorse any particular seller. Check the listing matches the checklist below before you buy.
✓ Look for
- "KKL" or "VAG 409.1" in the nameThis is the "dumb" K-line cable VQLab talks to directly.
- USB connectionPlugs straight into your Windows PC and shows up as a COM port.
- CH340 chipCheck the listing says CH340 (sometimes CH340G or CH341). The cable on our own car uses one.
- 16-pin OBD2 plugFits the diagnostic port under the dash of supported cars.
✕ Avoid
- ELM327 adaptersUsually blue and sold as "OBD2 scanners". They only speak generic OBD and cannot flash.
- Bluetooth or Wi-Fi donglesToo slow and unreliable for flashing. Use a wired USB cable.
- FTDI (FT232RL) cablesThey look the same, but they don’t work with VQLab. Check the chip before you buy.
- "K+DCAN" or brand-specific cablesBuilt for other makes (often BMW) and may be wired differently.
Setting it up
- 1Install the driver
Windows usually finds it. If not, install the CH340 driver from wch-ic.com.
- 2Find the COM port
Plug the cable into your PC, open Device Manager, and look under "Ports (COM & LPT)" for the cable’s COM number.
- 3Connect to the car
Plug into the OBD2 port and turn the ignition on with the engine off. In VQLab, pick that COM port and click Read ROM to make your backup.
Got your cable? Download VQLab Lite and back up your ROM for free.