Default is open loop, yours sounds like it is working as it should.
I have a slight fault on the lambda probe on the rear bank, which, if disturbed, causes the probe to stop reading and it goes open loop, it does fire up a code but I can't remember what it is.
The wiring for the post cat probe is completely broken (and hidden in the sheathing) but it hasn't given a code, it also passed the MOT.
Your coolant temp sounds correct.
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Former custodian of the legend that was FE54 - RIP
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