davidlehmann12

Renault Master power loss whistling noise

My 2008 Renault Master diesel has the check engine light on, reduced power, poor engine response, and occasional stalling. Fuel consumption is also higher. I hear a whistling noise and a loud hissing during acceleration. Could this be a faulty wastegate valve?

4 comment(s)

I had similar symptoms with my Renault Master. Have you checked the MAP sensor and intercooler hoses for leaks? A faulty wastegate or a boost leak could certainly cause those issues. What's the mileage?

The mileage is 181633 km. I haven't checked the MAP sensor or intercooler hoses yet. Where are they located, and can I easily inspect them myself?

Given the mileage and symptoms, and that you've not checked those components, it might be best to take it to a workshop. While it could be the MAP sensor or hoses, the hissing sound strongly suggests a wastegate issue, which can be difficult to diagnose without proper tools. I ended up needing a new turbocharger. I hope you get this sorted.

I appreciate your insight! I'll take it to a reputable workshop for inspection. Based on your experience, it seems the wastegate is likely the issue. Thanks for the advice. The total repair cost was 860€.

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