Peugeot Fixed: P306d

Remove the air intake ducting to expose the motorized throttle housing.

Carbon buildup or a failing internal sensor in the electronic throttle housing (motorized butterfly valve).

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Do not rely on cheap, generic OBD-II code readers, which often output misleading sensor descriptions for manufacturer-specific PSA codes. Instead, plug in a specialized scanner like to pull real-time telemetry.

If the EVAP valve operates correctly, tackle physical restrictions. Remove the air intake ducting to expose the

| Repair Action | Estimated Cost (USD/GBP/EUR) | |----------------|-------------------------------| | Drain & refill AdBlue (DIY) | $30–50 | | Drain & refill (shop) | $100–200 | | Software update (dealer) | $120–250 | | AdBlue tank replacement (parts + labor) | $800–1,500 |

To save you time and money, here is a streamlined summary of the most likely fixes for the P306D code. The table below ranks the common solutions based on their likelihood of solving the problem and the difficulty involved. This link or copies made by others cannot be deleted

Usually follows shortly after the cruise control error.

If the wiring is brittle or damaged near the cylinder head, cut out the compromised section and solder in a new injector connector repair pigtail. Ensure it is well-insulated with heat-shrink tubing.

The code (often appearing as P306D-22 ) typically indicates a "coherence" problem within the evaporative emission (EVAP) system . In simple terms, the car’s computer (ECU) detects that the pressure or flow of fuel vapors isn't what it expects. Common Symptoms: