: Your computer might be using the wrong COM port (it usually needs to be
For a deep dive into specific BMW error codes and setups, you can find detailed community discussions and guides on platforms like Bimmerpost Bimmerforums Are you using a device or a standard K+DCAN cable for your connection? VXDIAG BMW INPA API Initialization Error Solution
Follow these troubleshooting steps in order, moving from the most common configuration mistakes to hardware checks. 1. Check Your K+DCAN Cable Switch (The Pin 7/8 Issue) inpa error 159
cd C:\EDIABAS\BIN
The USB-to-serial driver (K+DCAN cable) is not set to COM1. : Your computer might be using the wrong
Open OBD.ini with Notepad and verify the very first lines look exactly like this: [OBD] Port=Com1 Use code with caution.
After fixing Error 159, perform a full INPA functional test: Check Your K+DCAN Cable Switch (The Pin 7/8
If you've confirmed everything above but the error persists, the physical hardware may be at fault.
Complete the installation and repeat Step 1 (as Windows often resets the latency timer back to 16ms during a driver update). Prevention Tips for Future Diagnostic Sessions