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charlotte_ice81

Peugeot 807 Boost Pressure Fault

Experiencing a boost pressure control fault on my 2009 Peugeot 807 diesel. Check engine light comes on intermittently, engine power drops, and throttle response is sluggish. Fuel consumption has also increased. Suspect a dodgy vacuum switching valve. Anyone else run into something similar?

Summary of the thread

A 2009 Peugeot 807 diesel is experiencing a boost pressure control fault, leading to intermittent check engine lights, reduced engine power, sluggish throttle response, and increased fuel consumption. The suspected cause is a faulty vacuum switching valve. After consulting with others and visiting a workshop, the issue was confirmed to be a defect in the vacuum switching valve, which was replaced, resolving the problem.

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4 comment(s)

friedrichshadow43

I had a similar problem with my 807. Reduced engine power is very unpleasant, and the increased fuel consumption even more so. Did you notice any compressor surge? Is there a noticeable pressure drop? Have you checked the boost controller or the boost solenoid?

charlotte_ice81 (community.author)

Thanks for the quick reply! I haven't specifically logged compressor surge or pressure drop, but I can try to get some data. When you say boost controller or solenoid, was it visibly damaged, or did you just replace it?

friedrichshadow43

I did not investigate it myself. I simply went to the workshop and let them fix it. It was indeed the boost solenoid. My advice would be to get your car checked out at a professional workshop.

charlotte_ice81 (community.author)

Took your advice and brought it to the workshop. It WAS a defect in the vacuum switching valve, just as I suspected. New valve fitted, and the boost is back where it should be. Cost me 140€ all in. Thanks for confirming my suspicion!

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PEUGEOT

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807