My car sometimes only accelerates in open driving loop and the

>>17719918
Vom.
Sensor is 0.2v-0.8v output.
But if its giving low values, then its running lean. A bad catalytic would read high/rich.
You can also swap upstream and downstream (if you have both) and see if the problem follows the sensor.
Or just buy a new one. They're cheap nowadays and are a common failure.
$29 for o2 sensor
$200 for a cheap universal cat.

While you're at it, swap the stocker out for a narrow/wide band o2 sensor and gauge. Uses same mounting hole and can plug it into stock ecu and a wide band gauge.