I have a 2009 SES and I have some questions about the TPMS. First, how long does the battery last for the sensor? Second, do you replace the battery or the whole unit? And third, if you have to replace the whole unit how much does it cost for one sensor and all four? Thank you,

as for the last question i think each sensor is like $45 or something along those lines. they're not cheap i know that.

i work at a tire shop. and we get a lot of cars in that have had sensors for 6 yrs now. so they will last quite a long time. now you are going to have some problems with them but thats with anything. as far as the cost ive replaced some that were as low as 50 but ive also replaced some that were 180, only available through dealer. so depending on the car depends on the cost. Its a whole unit that gets replaced. cant replace the batteries.