leon_friedrich73
Safrane bypass valve malfunction and overheating
Summary of the thread
A 1999 Renault Safrane was experiencing a bypass valve malfunction and engine overheating, with a diagnostic tool consistently storing the error. The issue was suspected to be linked to an underlying problem in the exhaust or vacuum system, potentially causing power loss. After consulting with others who had similar experiences, it was suggested to inspect for vacuum leaks. Ultimately, a workshop identified a faulty temperature sensor as the root cause, which, once replaced, resolved the overheating and bypass valve error.
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4 comment(s)
leon_friedrich73 (community.author)
Yes, I have noticed a slight decrease in power, particularly when accelerating uphill. Could you elaborate on which vacuum lines were problematic in your case? Any specific areas I should inspect?
richardbauer46
The power loss confirms my suspicions. Honestly, diagnosing the precise vacuum line without proper equipment is tricky. Given the overheating, and the potential for further damage, I'd strongly recommend a thorough inspection at a trusted workshop. They'll be able to perform a smoke test and pinpoint the leak quickly.
leon_friedrich73 (community.author)
I followed your advice and took it to a workshop. Turns out, it was a faulty temperature sensor causing the bypass valve error and the overheating. Replaced the sensor, cleared the error, and everything seems to be running smoothly now. Total cost: 0€. Thanks again!
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RENAULT
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SAFRANE
richardbauer46
I had a similar issue with my Safrane, though I can't recall the exact year. The bypass valve error was indeed a symptom of a bigger problem. Do you experience any power loss alongside the overheating? That could point to a vacuum leak affecting the turbocharger (if equipped).