Peugeot 607 Diesel Engine Power Loss

Hi, I'm having trouble with my 2002 Peugeot 607 diesel. It's done 86026 km. Lately, the check engine light has been coming on, and the engine seems to have lost a lot of power. The engine response is very poor, and there's a whistling noise, almost a loud hissing, when I accelerate. Sometimes, the engine even stalls when idling. I've also noticed higher fuel consumption. I've read online that it could be related to a boost pressure actuator fault. Could it be the electrical bypass valve? Any ideas or similar experiences?

4 comment(s)

I had something similar with my 607. Check the pressure sensor and the turbo system for any leaks. The symptoms you described match what I experienced when my turbocharger actuator valve started to fail. Have you checked for any obvious signs of a boost leak?

Thanks for the quick response! Where exactly is the pressure sensor located, and how would I check for a boost leak? I'm not very experienced with car mechanics, but I'm willing to give it a try before taking it to a workshop.

The pressure sensor is usually near the turbocharger, but honestly, if you're not comfortable with mechanics, I'd suggest taking it to a workshop. A faulty actuator valve can cause more damage if not addressed correctly. It does sound like a defective electrical bypass valve to me, so I'd get it checked.

Thanks a lot for the advice! I took it to the workshop, and you were right – it was the boost pressure actuator. They replaced it for 250€, and now it runs like new. I really appreciate your help!

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