Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Crankcase Ventilation Systems: Description
Peugeot vehicles use crankcase ventilation systems to prevent blow-by gases from reaching the atmosphere. Gasoline models use similar systems, which include a PCV valve with oil screen, manifold calibrated jet (orifice), air cleaner orifice, and connecting hoses. Diesel models have a hose from the valve cover to the intake manifold that recirculates crankcase vapors.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.