Alphard Whistling Noise and Power Loss

Hey, got a problem with my 2013 Toyota Alphard, gasoline engine. Check engine light is on, feels like I'm driving with half the horses. Engine response is terrible, and I'm hearing this weird whistling noise, almost a loud hissing when accelerating. Sometimes it even stalls at idle, and my fuel consumption is way up. Mileage is at 47931 km. Any ideas? Suspecting maybe the turbo system, or something to do with the boost pressure actuator?

4 comment(s)

I had a similar problem with my Alphard. Is it like a boost leak, maybe? Have you checked the pressure sensor or the turbo actuator itself?

Boost leak could be it, yeah. Where exactly did you have a look to find the issue? Did the turbo actuator look obviously broken?

I didn't dig too deep myself. Based on the symptoms, especially the whistling noise, and the error codes, it really sounded like the electrical bypass valve was defective. I recommend you take it to a workshop to have it checked properly.

Thanks a lot for the info! Took it to the shop and you were spot on, electrical bypass valve was indeed defective. They replaced it, cost me about 250€, and now it runs like new. Appreciate the help!

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