# Preflight fail baro sensor 0 missing

**URL:** <https://discuss.px4.io/t/preflight-fail-baro-sensor-0-missing/17702>\
**Category:** Pixhawk\
**Created:** [July 16, 2020, 11:30am UTC](https://discuss.px4.io/t/preflight-fail-baro-sensor-0-missing/17702 "2020-07-16T11:30:56Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Maxor](https://discuss.px4.io/user_avatar/discuss.px4.io/maxor/32/6410_2.png) [@Maxor](https://discuss.px4.io/u/Maxor)\
**Post date:** [July 16, 2020, 11:30am UTC](https://discuss.px4.io/t/preflight-fail-baro-sensor-0-missing/17702/1 "2020-07-16T11:30:56Z")

</div>

Hello,

I’m flying with Pixhawk 4 mini and when I try to arm my quad i get this message: “preflight fail baro sensor 0 missing”. It was 5 minutes after a successful flight.  
When I check the devices on my Pixhawk I do not see any baro0 or ms5611 devices:

 ![noBaro](https://discuss.px4.io/uploads/default/original/2X/4/46ba2854e0f4c10ce047a1cb5e9e602b21bb7352.png)

I have another Pixhawk 4 mini and when I check its devices I do get baro0 and ms5611:

 ![bero](https://discuss.px4.io/uploads/default/original/2X/c/c4835c1b6cabee16263ed3816481bfad66d7d1f4.png)

Is this a hardware problem?

Thank you very much

---

<div class="post-metadata">

**Author:** ![jbrindle](https://discuss.px4.io/letter_avatar_proxy/v4/letter/j/e9c0ed/32.png) [@jbrindle](https://discuss.px4.io/u/jbrindle)\
**Post date:** [January 1, 2021, 3:21am UTC](https://discuss.px4.io/t/preflight-fail-baro-sensor-0-missing/17702/2 "2021-01-01T03:21:02Z")

</div>

I’m having this exact issue with a brand new pixhawk 4 mini, baro or ms5611 don’t show up in /dev, nor can I get anything going by running ms5611 start.

Did you ever figure it out? Was the hardware bad?

---

<div class="post-metadata">

**Author:** ![Maxor](https://discuss.px4.io/user_avatar/discuss.px4.io/maxor/32/6410_2.png) [@Maxor](https://discuss.px4.io/u/Maxor)\
**Post date:** [March 14, 2021, 8:27am UTC](https://discuss.px4.io/t/preflight-fail-baro-sensor-0-missing/17702/3 "2021-03-14T08:27:29Z")

</div>

I believe it is a hardware failure, Never managed to fix it

---

<div class="post-metadata">

**Author:** ![Murray\_Louw](https://discuss.px4.io/user_avatar/discuss.px4.io/murray_louw/32/7850_2.png) [@Murray\_Louw](https://discuss.px4.io/u/Murray_Louw)\
**Post date:** [April 8, 2021, 6:37am UTC](https://discuss.px4.io/t/preflight-fail-baro-sensor-0-missing/17702/4 "2021-04-08T06:37:31Z")

</div>

I also believe it is a hardware failure. I think HolyBro should do something about it since its so common.

You can try fixing it by adding an external baro as I explain here: [Pixhawk 4 mini baro sensor 0 missing - #13 by Murray\_Louw](https://discuss.px4.io/t/pixhawk-4-mini-baro-sensor-0-missing/11199/13)