Inpa Error 159 Fix Jun 2026

Right-click on (where X is your port number) and select Properties .

. This communication fault occurs when EDIABAS does not receive a response from the interface or the vehicle within the specified timeframe. Most Common Causes & Solutions DIS - Fault 200 159 - Bimmerforums - The Ultimate BMW Forum

Cheap aftermarket K+DCAN cables often feature substandard internal microcontrollers (such as counterfeit FTDI chips). These clone chips overheat rapidly or fail to process high-speed byte streams, dropping packets mid-request and mimicking an ECU timeout error. If the error happens intermittently after a few minutes of smooth operation, the cable hardware itself is likely failing under load.

"Group error: 159"

If you are using a round 20-pin adapter (under the hood of E46/E39) with a 16-pin OBD2 cable, the adapter must bridge pin 7 (K-Line) and pin 8 (Battery+). Cheap adapters have no electronics—just wires. This creates a "bounce" in the K-Line signal during initialization. INPA starts a job, the line glitches, and the ECU cancels.

BMW’s K-Line is a shared data wire. Many modules (DME, EGS, ABS, Airbag, IKE) all talk on the same green wire (Pin 7 on the OBD2 port). If one module is faulty, crashed, or stuck in a "high" state, it holds the K-Line high (12v), preventing any other module from communicating. INPA tries to wake up the DME, but the dead module is screaming over it. Result: Error 159.

If you have tried all the steps above and are still stuck, could you tell me: What is the BMW you are working on? inpa error 159

Help you by Windows.

Have another solution for INPA Error 159 that we missed? Share your experience in the comments below. Your fix might save someone else’s weekend.

To help isolate your specific issue, what and production year are you diagnosing? Knowing which module triggers the error when clicked would also help target the fix. Share public link Right-click on (where X is your port number)

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.

Next, search for . It should read: NetworkProtocol = TCP . Save and close the file.

INPA requires the hardware and software to be on the exact same "channel." Open > Ports (COM & LPT) . Most Common Causes & Solutions DIS - Fault

: Using an older ADS connector when the software expects a standard OBD setup, or using a poor-quality "blue board" cable that fails to maintain a stable data stream.