noah_shadow10

Seat Toledo engine issues

I am experiencing a problem with my 2006 Seat Toledo, gasoline engine. The check engine light is on, engine power is reduced, and the engine response is poor. I also hear a whistling noise, a loud hissing when accelerating, and the engine sometimes stalls at idle. Fuel consumption is also higher than usual. Could a defective electrical bypass valve cause these symptoms, or is it likely something else related to the turbo system or boost control?

4 comment(s)

Sounds like a pain! I had something similar happen on my old Renault, though it wasn't a Seat. The whistling and hissing are classic signs of a boost leak. Have you checked all the hoses connected to the turbo system? Sometimes they crack or come loose. It could also be the pressure sensor giving false readings, messing with the boost control.

When you mention checking the hoses, is there a particular area I should focus on? And how would I identify a faulty pressure sensor?

Okay, given all those symptoms, especially the stalling, a faulty bypass valve seems like the most probable cause. It’s responsible for regulating the boost pressure. While checking hoses is good practice, a failing valve can definitely cause all those issues. If you're not comfortable testing it yourself, I'd advise a workshop. They can properly diagnose and replace it.

Thank you for your assistance. The issue was indeed the electrical bypass valve. Replacing it cost 250€, and the car is now running smoothly.

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