Talisman Turbo Boost Pressure Sensor

Sounds like a boost leak for sure. That whistling/hissing points to it. The pressure sensor could be faulty, but have you checked the hoses going to and from the turbocharger for any cracks or loose connections? I had similar symptoms on my old Megane once. A cracked hose was the culprit.

Thanks for the quick reply! I haven't checked the hoses myself yet, to be honest. Where exactly should I be looking for those hoses? And is there anything specific I should be looking for besides cracks and loose connections? I'm a bit of a novice when it comes to this.

Okay, since you're not too familiar, I'd suggest getting it checked by a mechanic. The hoses run from the turbo to the air intake. You could try following them, but it's best to have someone with experience take a look. Given all those symptoms, you're probably dealing with a boost pressure sensor issue, but it's wise to confirm that before replacing parts. A workshop can confirm the problem and do the job professionally. The defective cable connection to the sensor is very likely in that case.

Thanks a lot for your advice! I took it to the workshop, and you were right. It was indeed the boost pressure sensor! The final repair cost was 95€. Appreciate the help!