Citroen C3 power loss whistling noise

Hey, need some help! My 2007 Citroen C3 diesel is giving me grief. The check engine light is on, and it feels like I've lost half the power. It's super sluggish, and there's this weird whistling noise when I accelerate, almost like a loud hissing. Sometimes it even stalls at idle, and my fuel consumption has gone through the roof! Mileage is at 101553 km. Any ideas? Could it be a boost leak?

4 comment(s)

Sounds familiar! I had something similar happen with my C3, though mine is a later model. Did you check the boost pressure actuator? Mine was doing the same thing – reduced power, weird noises. Is it struggling to accelerate?

Boost pressure actuator, eh? Where is that even located, and how would I check it? Could that really cause all these problems? The hissing is driving me crazy!

Yeah, mine was the boost pressure actuator valve. Honestly, I wouldn't mess with it too much yourself unless you know what you're doing. It's probably best to take it to a workshop and have them check the electrical bypass valve. I bet that's your problem. Good luck!

Thanks so much for the tip! I took it to the workshop, and you were spot on – the electrical bypass valve on the boost pressure actuator was defective. Cost me 250€ to replace, but it's running like new again. I really appreciate the help!

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