siegfriedwolf32

Peugeot 406 Boost Pressure Issue

I'm having a big problem with the boost pressure on my 2000 Peugeot 406 Diesel model. It's done 199123 km. The check engine light comes on sometimes, the engine power drops, and it doesn't respond well. Sometimes it stalls when idling, and I'm using more fuel than usual. I can hear a whistling noise that turns into a loud hiss when I accelerate. Could a bad wastegate valve be causing this?

4 comment(s)

I have a 406 and those symptoms sound very familiar. Have you checked the MAP sensor readings? Turbo lag can also manifest similarly. Listen closely to the turbo area and around the throttle body. A boost leak anywhere will cause those issues. Do you have access to a pressure sensor to check the boost control?

Thanks for the quick reply. I haven't checked the MAP sensor yet. What values should I be looking for when idling versus under load? Also, can I easily check the wastegate valve without taking it apart?

Without proper tools, wastegate inspection can be tricky. If the symptoms appeared suddenly, I would highly suspect a mechanical failure. Check for obvious damage but frankly, if you are experiencing all of those issues, it's time for a proper diagnostic at a reputable workshop. It will save you time and money in the long run. I ended up paying 860€ at the end for a similar fix.

I appreciate the advice. I'll get a diagnostic assessment at a workshop based on your experiences. Thanks again for your help.

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