# Tpms sensor replacement **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mazda3, mazda\ **Created:** [September 10, 2016, 6:52pm UTC](https://community.cartalk.com/t/tpms-sensor-replacement/95527 "2016-09-10T18:52:02Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![crusty-XII](https://avatars.discourse-cdn.com/v4/letter/c/53a042/32.png) [@crusty-XII](https://community.cartalk.com/u/crusty-XII)\ **Post date:** [September 10, 2016, 6:52pm UTC](https://community.cartalk.com/t/tpms-sensor-replacement/95527/1 "2016-09-10T18:52:02Z")
2009 Mazda 3, one of the TPMS sensors has a cracked mounting nut, the dealer wants $140 to replace the sensor. I checked local auto parts stores for the nut, and there is a repair kit for about $5… can I replace the nut without demounting the tire? ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [September 10, 2016, 7:40pm UTC](https://community.cartalk.com/t/tpms-sensor-replacement/95527/2 "2016-09-10T19:40:57Z")
Yes, as long as the tire remains properly inflated during the procedure Be careful that you don’t overtighten the new nut ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [September 10, 2016, 11:46pm UTC](https://community.cartalk.com/t/tpms-sensor-replacement/95527/3 "2016-09-10T23:46:06Z")
If the valve stem is damaged you won’t be able to remove the nut and replace it. Why did the nut crack? ---
**Author:** ![galant](https://avatars.discourse-cdn.com/v4/letter/g/77aa72/32.png) [@galant](https://community.cartalk.com/u/galant)\ **Post date:** [September 10, 2016, 11:52pm UTC](https://community.cartalk.com/t/tpms-sensor-replacement/95527/4 "2016-09-10T23:52:16Z")
I will just have a tire shop do it, should not cost more than $25. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [September 10, 2016, 11:52pm UTC](https://community.cartalk.com/t/tpms-sensor-replacement/95527/5 "2016-09-10T23:52:33Z")
But I have seen instances where the nut was damaged, but the valve stem itself was still okay, and so were the threads just saying I would guess the nut is cracked, due to overtightening ---
**Author:** ![crusty-XII](https://avatars.discourse-cdn.com/v4/letter/c/53a042/32.png) [@crusty-XII](https://community.cartalk.com/u/crusty-XII)\ **Post date:** [September 15, 2016, 2:53pm UTC](https://community.cartalk.com/t/tpms-sensor-replacement/95527/6 "2016-09-15T14:53:51Z")
thanks for the answers, i think the tire shop option is the best choice, and i don’t know why the nut cracked, the dealer found it during an inspection, was probably cracked from before i owned the car, cause i never touched any of them…Crusty