in the engine relay unit, specifically related to the ignition or main power supply circuits. Understanding Fault Code 09B7 This code is often triggered by the BSI (Built-in Systems Interface) BM34 (Engine Fuse Box/Relay Unit) when it detects an electrical anomaly.
Sensors fail. The thermistor inside the probe can degrade, sending resistance values to the ECU that correspond to impossible temperatures (e.g., reading 140°C when the engine is cold). This is the most common cause on models like the Peugeot 308, 3008, and 208. 09b7 Peugeot HOT-
That’s not road rage.