Inpa Error 159 Extra Quality Jun 2026

BMW modules are highly sensitive to voltage drops. When voltage sags, the gateway modules drop diagnostic requests. Connect a dedicated battery maintainer or stable charger capable of delivering a clean 20A+ supply to the under-hood terminals while scanning. Avoid running diagnostics while a standard consumer-grade trickle charger is connected, as these do not supply enough current to offset the vehicle's wake cycle. Cable Quality Checks

This guide explains what Error 159 means, why it happens, and how to fix it step-by-step. What is INPA Error 159?

The virtual port number assigned by Windows does not match the hardcoded port in the INPA configuration files.

Some cheap Chinese interfaces come with faulty firmware for the PIC microcontroller. You can re-flash them using (for FTDI-based cables). Download the BMW Standard Tools compatibility firmware (version 1.5 or 1.6). After re-flashing, the interface will correctly handle job termination acknowledgments, eliminating Error 159. inpa error 159

Some specific scenarios require more advanced fixes.

Error 159: API function unsuccessful Error in API call. Task not possible.

Error in job 'RDSYS' or 'RESULT' : Error 159 BMW modules are highly sensitive to voltage drops

By methodically aligning your Windows port configurations with EDIABAS, you can permanently eliminate the timeout gaps that cause INPA Error 159. To help narrow down the exact issue, let me know: What and year are you working on?

Find the dropdown menu and change it from 16 to 1 . Click OK to save and exit. Step 2: Match the COM Port in Device Manager and OBD.ini

: Close INPA and manually terminate any EDIABAS.exe processes in the Task Manager before trying again. The virtual port number assigned by Windows does

Once you have a working setup, lock it in:

Go to Control Panel > Power Options > Change Plan Settings > Change Advanced Power Settings > USB Settings > USB selective suspend setting = Disabled .