A: If 43920 appears as an error code in ISTA (very rare), it may relate to a specific ECU communication timeout. Search the exact fault code (e.g., "CD943920" or "S 043920") within the ISTA test plan.
Before we dissect "43920," let’s establish a baseline. bmw ista 43920
If you are running an older version—say ISTA 4.36.x—and you try to diagnose a 2022 BMW M340i, you may get "Function not supported" or "Control unit not found." Upgrading to (4.39.20) resolves those gaps. A: If 43920 appears as an error code