20 Pin to 16 Pin OBD2 Cable for BMW. OBD1 to OBD2 Diagnostic Adapter

This 12-pin OBD1 male to 16-pin OBD2 female adapter is designed to bridge modern diagnostic tools with BMW vehicles equipped with the round under-hood diagnostic port. It allows your OBD2 scanner to communicate properly with OBD1/early OBD2 BMW systems for advanced diagnostics and coding.

Use this adapter to perform functions such as:

Reading and clearing fault codes

Full system diagnostics

ECU communication and coding

Bidirectional controls (scanner-dependent)

This is a male-to-female extension cable built for stable, interference-free data transmission when using compatible diagnostic software and scan tools.

Wide BMW Compatibility (20-Pin Round Diagnostic Port Required)

Compatible with BMW models equipped with the 20-pin under-hood diagnostic connector, including:

E28, E30, E32, E34

E36, E38, E39, E46

E52, E53

R50, R52, R53 (Mini)

⚠️ Important: Please physically verify that your vehicle has the 20-pin round diagnostic port under the hood before purchasing.

MS42-equipped E46 models that retain the 20-pin connector must be flashed and diagnosed through this port.

Durable Extension Design – 15.75 in (40 cm)

Total cable length: 15.75 inches (40 cm)

Functions as an extension to reduce strain and wear on your vehicle’s diagnostic port

Provides a secure, reliable connection with consistent signal stability

Ideal for tuning, diagnostics, and flashing when working on BMW platforms that require the 20-pin interface.