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For INPA to communicate reliably, the USB-to-Serial latency must be set to 1ms. Open on your PC.
A mismatch between the COM port assigned in Windows Device Manager and the OBD.ini file.
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) inpa error 159
Your software must be "looking" at the same port your cable is plugged into. DIS - Fault 200 159 - Bimmerforums - The Ultimate BMW Forum
Ensure the is set to COM1 (unless your OBD.ini specifies otherwise). 2. Verify OBD.ini and Ediabas.ini Configuration For INPA to communicate reliably, the USB-to-Serial latency
Expand and right-click your cable (e.g., USB Serial Port ). Select Properties > Port Settings > Advanced . Change the Latency Timer (msec) from 16 down to 1 .
Loose OBD-II port connections or faulty USB ports on your laptop. Attempting to run INPA while another EDIABAS-based tool
The Windows COM port latency is often set too high (default is usually 16ms), causing the software to "time out" before the car responds.
Some vehicles, especially E90/E92 LCI models, require specific K-Line or D-CAN speeds to be set manually.
Whether you are using a standard K+DCAN cable or an advanced interface like VXDIAG, resolving this error usually requires checking hardware connections, driver settings, and software configuration. Common Causes of Error 159