A circuit in my house has a 20amp, 12 gauge circuit on which there are multiple outlets/lights. After fixing a GFCI circuit, that tested “open ground”, I decided to test some other outlets, on another circuit, and the first one tested “open neutral”, and then “open ground”. I shut off the power, and removed the outlet, which looked OK. After putting it back in, it still tested “open ground”. I checked another outlet on the circuit, and it tested the same. If on outlet on a circuit tests “open ground”, will ALL test that way?
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You really should have an electrician check things out.
Anything downstream is going to test open after a bad connection.
Open means that the wire in question is not providing continuity as it should.
Any outlet on a branch circuit after the break in the wire (or loose connection) will provide evidence of the issue.
They key to your question is that many outlets are wired sequentially in a daisy chain where an outlet is fed/wired from the prior outlet. Thus if you get a non-connection it will affect all outlets downstream but not upstream of the break. If you get an open outlet the problem may actually be at the upstream outlet.