P3067 — Boost pressure control valve 4, N389, electrical malfunction

P3067 is stored when the ECU sees malfunction on turbocharger or boost control. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.

Common causes

The cause is almost always one of a few things. Here they are — P3067 rarely comes from anything outside this list:

• Boost hose split or clamp loose
• Wastegate or variable-vane mechanism sticking
• Boost pressure sensor reading wrongly
• Turbo bearing worn
• Intercooler leaking

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Pressure-test the boost pipework for leaks — a split hose mimics a failed turbo and costs a fraction to fix
2. Inspect the actuator and linkage for free movement
3. Compare the boost sensor reading with the commanded value on live data
4. Check the turbo for shaft play and oil in the intake only after the pipework is proven sealed

That is what holds for P3067 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.