Peugeot 508 Overheating Bypass Valve Error

I have a 508 too, and I had similar problems recently. Were there any engine stalls or fuel efficiency drops beforehand? It could be related to the exhaust system.

Engine stalling, yes, now that you mention it! Fuel efficiency has been terrible too. So, you think this bypass valve error is just a symptom of a bigger exhaust issue?

Correct. In my case, the bypass valve error was consequential. Given the engine stalling and decreased fuel efficiency, I recommend a diagnostic evaluation by a certified workshop to find the root cause.

Thanks! I took your advice, and the workshop sorted it. The bypass valve was a red herring, just a symptom of another fault, like you said. It's fixed, and it was free! Cheers for the help!