Buy the listed canbus module and wire two connectors,

4pin and 2pin

The 2 pin will connect to your can high and can low wires while the 4 pin will be used to connect with the esp 32 wroom.

The Pro Kit Provides a stl case for the module so you can print it and make sure the module does not get damaged

Note: NOT all vehicles will be compatible with this specific canbus module, please wait untill compatibility is confirmed with your vehicle before you order one.

Locate your CAN H and CAN L Wires, each vehicle may differ and the colors / pins may be different, please do your own research and find out what the best location to tap into you vehicle would be, most cars it will be the OBD Port but some vehicles may not have it there.

For Most E46 Models the best location to tap in will be behind the stock dash on the black connector,

There you will find two wires 

Yellow/RED

Yellow/Brown

These are your Can H and Can L wires.

Now attach the 2 Pin connector to the Can Wires and connnect it to the Module, make sure the Correct wire is going to the correct pins as labeled in the instructions manual.

From there connect the Module to the Esp32 using the 4 pin connector and start the car.

If Installed Correctly Canbus will be able to run on its own without the extra OBD2 ELM327.

If something does not work please go back to the instructions manual and start over,

PLEASE BEFORE YOU MESSAGE ME TRY FIX IT YOURSLEF, THE INSTRUCTIONS HAVE EVERYTHING YOU NEED, JUST READ IT!!

The More people waste my time by asking dumb questions the less time i have to work on updates and fixes, pls use the instructions