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Mistra Bypass Valve Error

My 2018 Hyundai Mistra with a gasoline engine is showing signs of a bypass valve malfunction at only 21943 km. I'm getting an error and the engine is overheating. Could a faulty bypass valve cause a vacuum leak, leading to power loss or stalling? I’ve checked the hoses.

A 2018 Hyundai Mistra is experiencing a bypass valve error, leading to engine overheating and concerns about potential vacuum leaks causing power loss or stalling. The issue may not be the bypass valve itself but rather a sensor failure triggering the error. Scanning for all error codes is recommended to identify the root cause, which in this case was confirmed to be a sensor issue, resolved without cost at a workshop.

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4 comment(s)

I had a similar issue with my 2015 Opel Astra. Same error code, overheating. Check for consequential errors – is anything else triggering the bypass valve issue?

Thanks. Regarding consequential errors, what specifically should I be looking for beyond the bypass valve itself? Is there a component or system that might trigger a false bypass valve error?

In my case, the bypass valve error was a symptom, not the root cause. Get the car scanned for all error codes. It's likely a sensor failure. Based on that it's best to go to a workshop.

I appreciate the insight. You were right; it was a sensor issue triggering everything. Took it in, and it was fixed for 0€. Thanks again!

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HYUNDAI

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MISTRA