Autel 20-Pin to 16-Pin OBD2 Adapter Cable for BMW — 40 cm Passive Converter, Durable

Autel's original 20-pin to 16-pin OBD2 adapter cable lets you connect modern OBD2 scanners to BMW models with legacy 20-pin diagnostic ports quickly and reliably.

If you own an older BMW with the 20-pin diagnostic connector and want to use a contemporary OBD2 tool, this Autel adapter provides a plug-and-play bridge. It is a passive converter cable only — not a diagnostic tool — purpose-built to protect the vehicle's factory port while enabling access to OBD2-compatible scanners for reading codes, running system checks, and performing ECU-related tasks when supported by your scanner.

Which BMW models work with this 20-pin to OBD2 adapter?

The cable supports BMWs equipped with the legacy 20-pin diagnostic outlet. It is designed for many common chassis and generations, making it suitable for a broad range of older BMW vehicles.

• Compatible with E28, E30, E32, E34, E36, E38, E39 and E46 models
• Also fits E52, E53 and Mini models R50, R52, R53
• Check your car’s under-dash connector to confirm it’s a 20-pin BMW diagnostic port

How simple is it to install and use the Autel adapter?

Installation is straightforward: the cable is a male-to-female extension that requires no drivers or power source. It connects your vehicle’s 20-pin socket to a standard 16-pin OBD2 scanner for immediate use.

• Plug the 20-pin end into the vehicle’s factory connector
• Attach your OBD2 16-pin tool to the other end — plug and play
• No external power supply or software installation needed for the adapter itself

Will this adapter affect diagnostic functions or power delivery?

This converter is a passive cable designed only to map the physical connection; it does not add power, diagnostic features, or software functions. Some advanced scanner functions depend on the scanner and vehicle capabilities, not the cable.

• The 20-pin port itself does not supply additional power through this cable
• Functions like ECU coding or bidirectional tests depend on your scan tool and car support
• Use the adapter only with scanners confirmed compatible with your vehicle’s protocols

What construction and durability features does the Autel adapter offer?

Autel builds this adapter from industrial-grade materials and precision-molded connectors to withstand frequent use while protecting the vehicle’s factory connector from wear. The 40 cm (15.75 in) length reduces stress from repeated plugging and gives comfortable working space.

• Precision injection-molded connectors for reliable contact and transmission
• Tested for 10,000+ plug cycles to ensure long service life
• 40 cm length helps minimize wear on the car’s OBD port and provides flexibility during diagnostics

Who this is for: technicians, independent mechanics, BMW enthusiasts and DIY owners with pre-OBD2 BMWs who want to use modern OBD2 scanners without modifying the vehicle. If you need a passive, high-quality adapter to bridge older BMW 20-pin diagnostic ports to 16-pin OBD2 tools — while preserving the factory connector and maintaining stable signal transmission — Autel’s original 20-pin to 16-pin cable is designed for that purpose. Remember: this product is an adapter cable only, not a diagnostic scanner; verify your scanner’s compatibility and the vehicle’s supported protocols before purchase.