P0105 on Peugeot — Rough running, blow-by from the engine and the cooling fan permanently at full speed

Code P0105 indicates that the intake manifold pressure sensor signal is inconsistent with the engine's operating conditions. On the Peugeot 208 1.2 PureTech it accompanies a ruptured diaphragm in the PCV valve built into the rocker cover.

System

Fuel injection

Component

Rocker cover with integrated PCV valve

Fault

The engine runs roughly, an abnormal blow-by noise can be heard and the radiator fan stays on at full speed.

Typical symptoms

• The engine runs roughly
• Abnormal blow-by noise coming from the engine
• The radiator cooling fan runs permanently at full speed
• Service light on
• ‘Engine fault: have the vehicle repaired’ message on the instrument cluster

Vehicles affected

• Peugeot 208 (U) 1.2 PureTech 12v

Main code

• P0105 Intake manifold pressure sensor - generic fault

Solution

See the repair procedure verified on Sema Repair.

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