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clarakrause64

Peugeot 407 Boost Pressure Fault

I am experiencing a boost pressure control fault with my 2007 Peugeot 407, Diesel engine, at 136460 km. The check engine light is on, engine power is reduced, engine response is poor, and fuel consumption has increased. Could a defective pressure sensor cause such symptoms?

Summary of the thread

A 2007 Peugeot 407 with a diesel engine experienced a boost pressure control fault, leading to reduced engine power, poor response, and increased fuel consumption. The issue was initially suspected to be caused by a defective pressure sensor. However, further discussion suggested that a faulty vacuum switching valve could also be responsible. A workshop diagnosis confirmed the vacuum switching valve defect, and its repair resolved the problem.

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4 comment(s)

heinz_jung1

Those symptoms definitely point to a boost issue. Have you noticed any unusual noises, like a hissing sound, when the turbo is supposed to be spooling up? A pressure drop could also be caused by a leak in the intercooler piping. Does the engine feel particularly sluggish at low RPMs?

clarakrause64 (community.author)

I have not detected any hissing sounds. The engine is indeed sluggish at low RPMs, exhibiting noticeable turbo lag. Could a defective vacuum switching valve also cause these issues, in addition to a faulty pressure sensor?

heinz_jung1

A vacuum switching valve issue is certainly plausible and could mimic the symptoms of a faulty pressure sensor. Considering the turbo lag and lack of hissing, it might be the more likely culprit. While diagnosing it yourself is possible, a workshop visit might save you time and potential misdiagnosis.

clarakrause64 (community.author)

Based on your assessment, I took the vehicle to a workshop. The diagnostic confirmed a defect in the vacuum switching valve. The repair cost 140€, resolving the boost pressure control fault.

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PEUGEOT

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407