P306d Peugeot May 2026

The "D" in P306D stands for Diesel, but not the common-rail, computer-controlled diesels we know today. This is the legendary XUD9 engine—a 1.9-litre, 8-valve, indirect injection diesel.

The Good (The Immortal Part):

The Bad (The Time Bomb Part):

In some Peugeot models, a software update resolves erroneous P306D codes (especially on 4-cylinder engines misreading cylinder numbering). p306d peugeot

The P306D fault code is a specific diagnostic trouble code (DTC) found in Peugeot and Citroën models equipped with DV6 diesel engines (most commonly the 1.6 HDi / e-HDi). The code technically stands for "Information on the current consumed by the injector: Injector 1/4." The "D" in P306D stands for Diesel, but

In plain English, this means the engine computer (ECU) has detected an electrical anomaly with the Number 1 Cylinder Injector. It is not a sensor failure; it is a failure of the hardware itself or the wiring leading to it. The Bad (The Time Bomb Part): In some