Freestar Overheating Bypass Valve Error

I had similar overheating issues in my Ford Freestar - don't recall the exact error code, but it was related to air intake. Check your exhaust system; back pressure can cause the engine to overheat. It's like trying to run with a blocked nose – all that pressure has to go somewhere.

Back pressure... interesting. So, the bypass valve error could be a symptom, not the cause? Anything specific in the exhaust system I should be inspecting?

Correct. The bypass valve error is likely a symptom. For the exhaust, focus on any restrictions – catalytic converter, muffler damage, even a kinked pipe can cause issues. If you aren't comfortable with that, it's best to let a shop diagnose it to avoid potential engine damage.

Turns out it was a blocked catalytic converter, leading to the overheating and triggering the bypass valve error. New converter installed, total cost 0€ under warranty. Thanks for the pointer!