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Jul 2, 2026
5
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I had the car in for a whistling noise and P0299 error code. Underboost so a boost leak. They took my money and did not do a smoke test as i told them. Neither sid they find the problem. So I just went out for 5min and found the problem. Directly under the intake hose from the airfilter there is a 90 degree hose from the turbo, there is a visible rip in it. I slightly pressurizes the complete system and could hear the noise also. Had they done a smoke test as I suggested they would easily have found it.

But anyway, I would like to find it as a sparepart because this is a really easy fix but I dont know where and how to find it. Could someone point me to a diagram of the hoses from the turbo to intercooler maybe? It is a Cupra Leon 310 from 2022.
 
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Any of those?
 
Thanks. But none looks right. Dont remember seeing a air mass meter between air box and hose. Maybe there are different versions?
My photo likely helps in no way 😂
The damaged hose exits from the turbo, has a bend and connects to some other hose that looked like it had some kind of insulation and then went on to the intercooler. It is short and has hose clamps on both ends.
 

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