If you are troubleshooting an older BMW (pre-2000) that uses only K-Line (pin 7) and not CAN, and you see Error 159 on all ECUs, the cable may be stuck in CAN mode. Solution:
Press the Start/Stop button pressing the brake/clutch pedal. Confirm that your instrument cluster lights turn on.
Disconnect the K+DCAN cable from the car, but leave it plugged into your laptop's USB port.
When diagnosing a BMW or MINI using the popular suite, encountering errors can be a frustrating roadblock. Among the most common and confusing issues for DIYers and professional mechanics alike is INPA Error 159 , often displayed alongside NET-0009: TIMEOUT .
Understanding INPA Error 159: Causes, Symptoms, and Complete Troubleshooting Guide inpa error 159
Is Error 159 happening across the entire car, or only when you click on one specific module (like the Airbag, ABS, or Transmission)?
This specific error typically displays as ERROR_ECU_BUSY_REPEAT_REQUEST or IFH-0009: No response from controlunit . It triggers when the INPA software sends a request over the data bus, but the target module fails to reply within the strictly allowed millisecond timeframe.
Follow these steps in order to isolate and fix the communication breakdown. 1. Optimize Windows COM Port Settings
Bridges pins 7 and 8. This is required for older BMWs (roughly 1998 to March 2007, like the E46, E39, and early E60/E90). If you are troubleshooting an older BMW (pre-2000)
: If using DIS or older GT1 software, ensure the IFHSrv32.exe server is running in the background before launching the diagnostic tool.
For the cleanest initialization sequence, plug the K+DCAN cable into your computer first, turn the car's ignition to position 2 (engine off, dash lights on), plug the cable into the OBD2 port, and then launch the INPA software.
Before assuming the DME is broken, check these three main causes, ordered from easiest to hardest:
Your hardware configuration files must match your physical Windows assignments exactly. Disconnect the K+DCAN cable from the car, but
Close these programs before launching INPA. To prevent automatic startup, check your Startup folder and disable unnecessary autostart entries.
BMW changed its diagnostic pin layout in March 2007. Using the wrong pin configuration causes instant timeouts.
that scans the Windows Device Manager upon startup, identifies the OBD interface, and automatically forces the latency to 1ms without requiring the user to navigate deep into driver settings 3. "IFHSrv32" Persistent Daemon