If the quality sensor is internally damaged, the entire AdBlue tank assembly (which contains the pump, level sensor, and quality sensor) may need replacement. This is expensive but definitive.
To put it simply, your engine's computer (ECU) has detected a mismatch between what it expects from the throttle valve and the actual air pressure reading inside the intake manifold. This discrepancy forces the ECU into a "limp mode," limiting performance to protect the engine. p306d peugeot fixed