If a Lambda sensor I'd wait until your daughter returns from uni to sort it.
As others have said its a consumable, so I'd just replace it rather than playing with possibly cleaning it.
Unless there's nothing wrong with it and it's actually doing it's job and flagging an emissions problem.
Seems these O2 sensors get a bad reputation, many rush out and replace them when the get a O2 related DTC as their reputation isn't great.
When it's quite possible all it's doing is noticing exhaust gases outside the tolerance, often due to something like a air/vacuum leak.
The pre cat O2/Lambda sensor will trim the fueling once the car has reached operating temp, if there's say an air leak/over fueling, the sensor will notice a lean/rich trim and it'll signal the ECU to compensate, richen/lean up.
If it can't trim back inside it's limit, it'll throw a DTC and engine light.
Get the actual code first before attempting to change it, if it's reporting a lean/rich reading, it's not the sensor that's duff, there's another problem elsewhere.
If it's reporting an open circuit, check the wiring connectors first.
If you need a new sensor, don't bother with the universal replacements you have to wire in yourself, get a direct plug in replacement like I have sitting here, new and unused, not needed, that comes with the correct special socket to remove it from the exhaust!