((new)) | P306d Peugeot

A frequent cause is the purge valve, located near the intake system, failing to regulate pressure properly, especially at low speeds.

: Disconnect the vacuum line from the purge valve leading to the intake manifold, safely plug/cap the open manifold port, and let the engine idle. If the fault clears and pressure returns to normal, the purge valve or EVAP canister must be replaced. Step 2: Smoke Test for Air Leaks p306d peugeot

: A faulty purge valve or a saturated EVAP canister can leak fuel vapors into the intake at the wrong time, confusing the pressure sensors. A frequent cause is the purge valve, located