theresaschubert9

Mini Countryman Diesel Engine Problem

I am experiencing a significant issue with my 2019 Mini Countryman diesel. The symptoms include reduced engine power, poor engine response, and the engine sometimes stalls at idle. I've also noticed higher fuel consumption and a distinct whistling noise, even a loud hissing sound when accelerating. It feels like the boost pressure system isn't working correctly. Could this be a defect in the wastegate valve?

A 2019 Mini Countryman diesel is experiencing reduced engine power, poor response, stalling at idle, increased fuel consumption, and a whistling noise, suggesting a boost pressure system issue. The symptoms point to a potential defect in the wastegate valve. After checking for a boost leak and reading the engine codes, it was confirmed that the wastegate valve was faulty. Replacing the valve resolved the issue, restoring normal engine performance.

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4 comment(s)

Reduced engine power and whistling? Sounds like a boost leak. Check all your hoses connected to the intercooler. A tear can cause all sorts of problems. Is the check engine light on? Have you pulled the codes to see what triggered it?

Thanks for the quick reply! Yes, the check engine light is on. I haven't checked the codes yet, but I will. Regarding the hoses, is there a specific area I should pay close attention to? Like, near the MAP sensor or throttle body?

That hissing noise is a classic sign of a boost leak. Think of it like a punctured bicycle tire. The pressure has to go somewhere. If the check engine light is on, get the codes read. But the wastegate valve is a definite possibility, especially with those symptoms. It might be time to visit a workshop for a proper diagnosis.

I appreciate your help in pinpointing the issue! Turns out it was a faulty wastegate valve, just as you suspected. Had it replaced, and the boost is back to normal. The total cost was 860€. Thanks again for your assistance!

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MINI

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COUNTRYMAN