The software is looking for the cable on a different virtual port than the one assigned by Windows.
Attempting to run INPA while another EDIABAS-based tool (like ToolSet32 or DIS) is active. Step-by-Step Solutions to Fix Error 159 1. Adjust Latency Settings (Most Common Fix)
If none of the above works, use this final checklist:
For INPA to communicate reliably, the USB-to-Serial latency must be set to 1ms. Open on your PC.
INPA error 159 is a communication timeout that halts diagnostics dead in their tracks. The vast majority of cases are solved by correctly setting the and the Latency to 1ms in your Windows Device Manager. For more stubborn cases, check your firewall, your EDIABAS.INI settings, or consider the advanced solutions outlined above. By working through the steps in this guide, you will systematically identify the root cause and restore your connection to your BMW's inner workings.
Follow these steps in order. Do not jump ahead. Test after each step.
The DME performs a self-check every time the ignition is turned on. Sometimes, a voltage spike or a bad sensor reading can corrupt the temporary memory.
Users of DIS (BMW’s Dealer Diagnosis System) or GT1 diagnostic heads may encounter a related error: .
The Error 159 is technically an (the backend software engine of INPA) labeled as a "Timeout" error.
Understanding what Error 159 means and how to resolve it ensures you can resume programming, coding, or diagnosing your BMW without expensive trips to the dealership. What is INPA Error 159?
