kurtguenther2
Seat Altea check engine light power loss
Summary of the thread
A 2010 Seat Altea diesel experienced a check engine light, reduced engine power, poor response, and increased fuel consumption. The suspected cause was a boost pressure control issue, potentially due to a faulty vacuum switching valve. After considering similar experiences and potential issues with the bypass valve or boost controller, the problem was confirmed to be the vacuum switching valve, which was replaced, resolving the engine performance issues.
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4 comment(s)
kurtguenther2 (community.author)
The pressure sensor seems okay. How did you figure out that the bypass valve or boost controller was the problem? Did you do any specific tests?
liliankrueger81
I didn't figure it out myself, I took it to a shop. They found the bypass valve problem pretty fast. If the pressure sensor is good, you might want to get a mechanic to look at the valve.
kurtguenther2 (community.author)
Confirmed fix. The problem was a bad vacuum switching valve, just like I thought. Replaced it, cost 140€. Engine runs great now. Thanks for the input.
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SEAT
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ALTEA
liliankrueger81
I had something similar happen with my Altea. Check engine light, power loss, the works. Have you checked the bypass valve or the pressure sensor? Sometimes turbo lag can also mean the boost controller is acting up.