Flex Bypass Valve Error Solved

Greetings. I recall encountering a somewhat analogous situation with a 2012 Volvo XC60, also gasoline-powered. The stored error indicated a malfunction in the turbocharger's bypass valve. However, further investigation revealed that the root cause was a faulty coolant temperature sensor. The erroneous sensor readings were, in turn, causing the engine management system to misinterpret the engine's thermal state, thereby triggering the bypass valve error. Is it possible to monitor the coolant temperature readings via an OBD-II scanner to ascertain their accuracy?

That's really interesting about the Volvo! I hadn't considered a sensor issue. I can definitely get my hands on a scanner. Just to be clear, are you suggesting the coolant temperature sensor could cause the bypass valve error and the overheating, or just the error?

The aforementioned sensor anomaly may precipitate both the bypass valve error and the observed engine overheating. Erroneous coolant temperature data can induce the engine management system to deviate from optimal operating parameters, potentially influencing bypass valve behavior and simultaneously compromising the efficacy of the cooling apparatus. Consequently, a professional diagnosis is warranted to conclusively ascertain the origin of the fault. Proceed with caution, as persistent engine overheating may engender consequential mechanical detriments.

I took your advice and brought it to my local trusted workshop. Turns out you were spot on - it WAS a faulty coolant temperature sensor! Replaced it, and the bypass valve error disappeared, and the overheating is gone. Total cost: 0€. I was told that the faulty sensor was replaced under warranty from a previous repair. Thanks a million for pointing me in the right direction!