# Catalyst monitor is never ready for smog test: could it be due to some other failure such as:

**URL:** <https://community.cartalk.com/t/catalyst-monitor-is-never-ready-for-smog-test-could-it-be-due-to-some-other-failure-such-as/76173>\
**Category:** Maintenance/Repairs\
**Created:** [December 16, 2012, 10:31am UTC](https://community.cartalk.com/t/catalyst-monitor-is-never-ready-for-smog-test-could-it-be-due-to-some-other-failure-such-as/76173 "2012-12-16T10:31:48Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![GreenLover2012](https://avatars.discourse-cdn.com/v4/letter/g/2bfe46/32.png) [@GreenLover2012](https://community.cartalk.com/u/GreenLover2012)\
**Post date:** [December 16, 2012, 10:31am UTC](https://community.cartalk.com/t/catalyst-monitor-is-never-ready-for-smog-test-could-it-be-due-to-some-other-failure-such-as/76173/1 "2012-12-16T10:31:48Z")

</div>

a bad catalyst converter?

---

<div class="post-metadata">

**Author:** ![GreenLover2012](https://avatars.discourse-cdn.com/v4/letter/g/2bfe46/32.png) [@GreenLover2012](https://community.cartalk.com/u/GreenLover2012)\
**Post date:** [December 16, 2012, 10:33am UTC](https://community.cartalk.com/t/catalyst-monitor-is-never-ready-for-smog-test-could-it-be-due-to-some-other-failure-such-as/76173/2 "2012-12-16T10:33:00Z")

</div>

or Catalyst monitor has been disabled??

---

<div class="post-metadata">

**Author:** ![GreenLover2012](https://avatars.discourse-cdn.com/v4/letter/g/2bfe46/32.png) [@GreenLover2012](https://community.cartalk.com/u/GreenLover2012)\
**Post date:** [December 16, 2012, 10:49am UTC](https://community.cartalk.com/t/catalyst-monitor-is-never-ready-for-smog-test-could-it-be-due-to-some-other-failure-such-as/76173/3 "2012-12-16T10:49:33Z")

</div>

or a bad Catalyst monitor ???

---

<div class="post-metadata">

**Author:** ![euryale1](https://avatars.discourse-cdn.com/v4/letter/e/41988e/32.png) [@euryale1](https://community.cartalk.com/u/euryale1)\
**Post date:** [December 16, 2012, 8:58pm UTC](https://community.cartalk.com/t/catalyst-monitor-is-never-ready-for-smog-test-could-it-be-due-to-some-other-failure-such-as/76173/4 "2012-12-16T20:58:05Z")

</div>

If you have a code post it here, along with what car, miles, and age.

---

<div class="post-metadata">

**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:** [December 16, 2012, 9:08pm UTC](https://community.cartalk.com/t/catalyst-monitor-is-never-ready-for-smog-test-could-it-be-due-to-some-other-failure-such-as/76173/5 "2012-12-16T21:08:24Z")

</div>

Your oxygen sensor and oxygen sensor heater monitors must have run and passed before the catalytic converter monitor will run.  
Have they all run to completion and passed?

---

<div class="post-metadata">

**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [December 17, 2012, 4:27am UTC](https://community.cartalk.com/t/catalyst-monitor-is-never-ready-for-smog-test-could-it-be-due-to-some-other-failure-such-as/76173/6 "2012-12-17T04:27:52Z")

</div>

If you don’t have a code, most parts stores will read them for you for free.