Skoda Scala Diesel Engine Issue

My 2020 Skoda Scala with a diesel engine is giving me headaches. The check engine light is on, and I've noticed reduced engine power and poor response. There's also a whistling noise, and a loud hissing when accelerating. Sometimes the engine even stalls at idle. I've also seen higher fuel consumption. After scanning for error codes, it points to a boost pressure actuator fault. From what I've read, the electrical bypass valve might be defective. Any thoughts before I take it to a shop?

4 comment(s)

I had a similar issue with my Renault Megane, also a diesel. Check engine light, power loss, the whole shebang. Did you check the boost pressure sensor? A faulty reading there can cause the ECU to limit boost, resulting in those symptoms. A hissing sound often indicates a leak in the turbocharger system. Is the whistling noise constant or only under load?

The whistling is mostly when accelerating. How did you diagnose the boost pressure sensor on your Megane? And is there a way to check for leaks in the turbocharger system without specialized equipment?

I used an OBD scanner to monitor the boost pressure readings in real time on my Megane. It was erratic. As for the leaks, you can visually inspect the hoses and intercooler for cracks or loose connections. However, the actuator fault combined with your symptoms strongly suggests a problem with the turbo wastegate or its control system. Given the potential complexity, I'd advise taking it to a workshop for proper diagnosis. Replacing the valve isn't too expensive.

Just wanted to let you know I got it sorted. It was indeed the electrical bypass valve. Repair cost me 250€. Thanks for the insight!

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