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Each tyre sensor has a unique code number which you will need in order for it to be programmed into the TPM system. Also remember not all the sensors are the same - for instance those for steel wheels are different than those for alloys, etc.
My local tyre dealer will supply and fit a brand new sensor for £28 all in but I would need to take it to a Renault or tyre dealer who has the proper programming equipment. Also remember if you buy a used unit and then pay for it to be fitted and programmed and it don't work will the seller re-imburse all of your costs??
Personally any of the second-hand ones I have seen on good old fleabay look kinda corroded which means they may be prone to breaking off when you wouldn't want it too.
Currently in madnoel10's garage:
Honda Civic 1.4l