This info is from the 02 model but I assume the later model will be similar although reference pressures may differ. If you remove it, after 20 ignition ignition cycles spaced at least an hour apart, you will get tyre sensor bad/missing message to replace one you are getting for low pressure. Tyre pressure low warning should only come on below 25 psi. If the tyre pressure sensor in the spare is not reading the pressure correctly it may be bad in which case replacement may be the only way to stop the message short of removing the fuse that powers the VIC.