If you are using an ADS interface (older BMWs with a 20-pin round diagnostic port under the hood), set:
Most INPA communication errors, including the 159 timeout, stem from Windows COM port settings. DIS - Fault 200 159 - Bimmerforums - The Ultimate BMW Forum inpa error 159
: Go to Device Manager > Ports (COM & LPT) > Right-click your USB Serial Port > Properties > Port Settings > Advanced. Change "Latency Timer (msec)" to 1 . If you are using an ADS interface (older
After fixing Error 159, perform a full INPA functional test: After fixing Error 159, perform a full INPA
Right-click on your (often COM3, COM4, or USB Serial Converter) and select Properties . Go to the Port Settings tab and click Advanced . Change the COM Port Number to COM1 .
BMW ECUs are sensitive to voltage fluctuations. If your car battery is below or the laptop USB port cannot supply stable 5V to the interface, the transceiver chips in the K+DCAN cable will produce corrupted data frames.
: INPA needs to see "Ignition: ON" and "Battery: ON" (indicated by black circles on the main screen) to communicate with most modules.