Outside temp sensors are usually mounted in front of the radiator along the top crossbar under the hood. You will see the wires leading to it near the middle section where the hood latch is located. They have a connector at the sensor so it is an easy unplug then plug in the new one type fix.
That all depends what sensors need replacing
people fix cars in hopes to get paid to fix them, or to buy them cheap, fix them, and sell them, high.
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You may have an ambient temperature sensor that has gone bad. I'm not sure what kind of vehicle you have, so I don't know what system your vehicle has. But that will give you a good start.
Outside temperature sensor either unplugged or broken. Do an internet search for the sensor using the specifics of your vehicle (ie 2003 BMW 330i outside temperature sensor). You will find replacement parts and diagrams of how to fix this yourself.
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fix cars
cars are the same in every country
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The outside air temperature should still have the same reading. The installed sending unit should not affect the temperature gauge.
Fix and or maintain cars
No