Inpa Error 159 =link= Jun 2026

Always plug your diagnostic cable into the exact same physical USB port on your laptop. Plugging it into a different port can cause Windows to reassign it to COM2 or COM3, breaking your settings.

A: The engine (DME) is on a different diagnostic address ($33). The airbag is on $58. If the DME is asleep or the K-Line signal quality is poor, the DME will time out but the airbag module—which is less sensitive—will respond. This still indicates a weak signal issue (latency or cable bridge).

Disconnect the K+DCAN cable from the car, but leave it plugged into your laptop's USB port. inpa error 159

Is the cable plugged into the used during setup? (Plugging into a different port changes the COM port number). Is the Latency Timer set to 1ms in Device Manager?

INPA Error 159 is rarely a sign of broken hardware or a dead ECU. In 95% of cases, it is a simple timing or port mismatch between Windows and Ediabas. By forcing the USB latency to , locking the port to COM1 , and matching those values in your configuration files, you will re-establish a clean communication pipeline to your BMW. Always plug your diagnostic cable into the exact

The cable is not handling K-Line (older) or D-CAN (newer) signals properly.

The most common trigger for Error 159 is a latency setting inside the Windows Device Manager. Connect your K+DCAN cable to a USB port on your PC. Open via the Windows Control Panel. Expand the Ports (COM & LPT) directory tree. Right-click on USB Serial Port and select Properties . Navigate to the Port Settings tab and click Advanced . Locate COM Port Number and change it exactly to COM1 . The airbag is on $58

At its core, INPA Error 159 indicates a fundamental breakdown in communication between your computer’s EDIABAS software layer and the diagnostic hardware connected to your BMW. Several distinct issues can trigger this timeout:

Ensure the is set to COM1 (unless your OBD.ini specifies otherwise). 2. Verify OBD.ini and Ediabas.ini Configuration

This error typically manifests as: API-Result-Text: Error #159 or ERROR_CLEAR_BUFFER / ERROR_FLUSH .