The fault code on Peugeot vehicles, often appearing as P306D-22 , indicates a "coherence" or consistency issue between the motorized throttle housing (air mixer) position and the inlet air pressure . Essentially, the engine control unit (ECU) detects that the air pressure in the intake manifold does not match the expected values based on where the throttle plate is positioned. Common Symptoms
Carbon buildup on valves + failing injector. p306d peugeot