While inspecting the throttle body on my Mazda RX-7 FC Turbo to diagnose a high idle problem (the engine idles at 1500 RPM even when warm), I noticed a severed connector (green and black wire). The connector is located underneath the intake manifold, near the throttle body.

Additionally, I found an open fitting or port beneath the intake manifold that appears to be for a hose or sensor, but I am unsure what it connects to. Around this area, I observed a lot of dried coolant, which could indicate a related issue.
I searched but I couldn't figure out anything


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It will be difficult to understand

 

Looks like the O2 sensor connector.

 

Maybe the previous owners redid the wiring? because the connector is attached but the broken one seems quite far from the sensor on the exhaust