jannik_dragon3

Seat Altea Fuel Economy and Hissing Sound

My 2009 Seat Altea with a gasoline engine is giving me some grief. I've noticed a significant drop in fuel economy lately, and the check engine light is constantly on. Also, there's a noticeable hissing sound when I accelerate. Could this be related to an air intake leak? I've heard that can cause engine misfires and other problems.

4 comment(s)

I had a similar issue with my Altea some time ago. Check the air intake hoses, especially the one connected to the throttle body. A leak there can cause a hissing sound, increased fuel consumption, and even trigger the check engine light. Think of it like a punctured tire; the engine has to work harder to maintain pressure.

Thanks for the tip. How did you pinpoint the exact location of the leak? I've visually inspected the hoses, but I can't see any obvious cracks or damage.

Yes, the symptoms align. I did a smoke test for leak detection, but eventually took it to a workshop. They confirmed it was a split in the intake hose, causing unmetered air to enter the engine. This affects the fuel-air mixture. I suggest taking it to a professional.

You were right; it was an air intake hose. The mechanic found the leak fast. Cost me around 100€ for the hose and labor. Fuel economy is back to normal, and the hissing is gone. Thanks for the help!

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