My 2008 Elise SC started showing a TPMS warning "LR Low" about six months ago. I double checked the tire pressure, but the warning remained. Then, in the past month, it started showing two more low pressure warnings. I tried increasing the pressure to about 32 psi -but still the warnings were displayed.
Logic and a bit of research indicated that this was not a problem with the central TPMS receiver unit. A possible explanation was that the batteries were failing in the wheel-mounted sensors (although I found one source that claimed a ten year life for the batteries). I looked at sourcing some replacement sensors...
As a last ditch attempt, I let almost all the air out of the tires that were generating warnings, and then pumped them back up to factory spec. And then, a miracle happened: the warnings ceased. And they remain absent one month later.
Has anybody else observed the TPMS sensors needing this kind of reset?