"Coherence between the position of the motorized throttle-housing (air mixer) and the inlet air pressure: Value higher than setting."
Peugeot utilized the robust XUD and later the HDi series engines in these vehicles.
While some generic scanners might suggest this is related to a cylinder misfire, on newer Peugeot PSA vehicles, it is strongly related to air intake/throttle issues. Common Symptoms of P306D
The engine restricts power, limiting speed to around 30-40 mph.
Has anyone solved P306D on a Peugeot diesel (HDi) or petrol? Common causes? Injector, wiring loom to injector 3, fuel pressure regulator, or ECU driver fault?
The vehicle may enter a restricted performance mode to protect the engine, often limiting RPM or disabling the turbocharger. System Failures:
