# Check engine light after warm start 02sensor

**URL:** <https://community.ecumaster.com/t/check-engine-light-after-warm-start-02sensor/2553>\
**Category:** GENERAL\
**Created:** [October 16, 2024, 12:17pm UTC](https://community.ecumaster.com/t/check-engine-light-after-warm-start-02sensor/2553 "2024-10-16T12:17:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Boostedvr5](https://avatars.discourse-cdn.com/v4/letter/b/df705f/32.png) [@Boostedvr5](https://community.ecumaster.com/u/Boostedvr5)\
**Post date:** [October 16, 2024, 12:17pm UTC](https://community.ecumaster.com/t/check-engine-light-after-warm-start-02sensor/2553/1 "2024-10-16T12:17:24Z")

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Hello Guys 👋

After every warm start my check engine light comes on for 6 or 7 seconds and then disappears again  
Is there no other way then to uncheck the checkmark?  
Maybe set a timer that after start the light dosnt come on?

Im curious if there are other people with this phenomenon?

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**Author:** ![PhoB](https://avatars.discourse-cdn.com/v4/letter/p/49beb7/32.png) [@PhoB](https://community.ecumaster.com/u/PhoB)\
**Post date:** [October 18, 2024, 12:34am UTC](https://community.ecumaster.com/t/check-engine-light-after-warm-start-02sensor/2553/2 "2024-10-18T00:34:08Z")

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Yep, sometimes on both Classic and Black.

And i also spotted, check goes on when knocking no matter check that option. It happends on both ecus.

If you use ADU, you can make some function with delay of activation light/icon to overcome these… Or wait for V3 you will be able to set something too.