# What happens if u installed a wrong o2 sensors?

**URL:** <https://community.cartalk.com/t/what-happens-if-u-installed-a-wrong-o2-sensors/169794>\
**Category:** Maintenance/Repairs\
**Tags:** bmw, 320\
**Created:** [September 10, 2020, 9:23am UTC](https://community.cartalk.com/t/what-happens-if-u-installed-a-wrong-o2-sensors/169794 "2020-09-10T09:23:52Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Sean-Lewis](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/sean-lewis/32/22463_2.png) [@Sean-Lewis](https://community.cartalk.com/u/Sean-Lewis)\
**Post date:** [September 10, 2020, 9:23am UTC](https://community.cartalk.com/t/what-happens-if-u-installed-a-wrong-o2-sensors/169794/1 "2020-09-10T09:23:52Z")

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Ok I bought some oxygen sensors ( o2 ) on amazon, because mine was going bad, so I installed them everything was normal. Then I realized that car start acting weird. \*my gas gage keeps bouncing \*i see my transmission light on and then my car went off .

What are the signs of a wrong o2 sensor on a BMW?

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [September 10, 2020, 9:33am UTC](https://community.cartalk.com/t/what-happens-if-u-installed-a-wrong-o2-sensors/169794/2 "2020-09-10T09:33:20Z")

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The signs of of bad O2 sensors are a check engine light and ODB2 codes that are set for O2 sensor errors.

How did you know they were going bad in the first place?

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**Author:** ![Sean-Lewis](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/sean-lewis/32/22463_2.png) [@Sean-Lewis](https://community.cartalk.com/u/Sean-Lewis)\
**Post date:** [September 10, 2020, 9:38am UTC](https://community.cartalk.com/t/what-happens-if-u-installed-a-wrong-o2-sensors/169794/3 "2020-09-10T09:38:41Z")

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My gas starts burning bad. It’s like burning waaaaay to fast. I ran the diagnostics and they said yeah it was…

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**Author:** ![Sean-Lewis](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/sean-lewis/32/22463_2.png) [@Sean-Lewis](https://community.cartalk.com/u/Sean-Lewis)\
**Post date:** [September 10, 2020, 9:40am UTC](https://community.cartalk.com/t/what-happens-if-u-installed-a-wrong-o2-sensors/169794/4 "2020-09-10T09:40:57Z")

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If it’s not the o2 sensors … I’m wondering if it’s the aftermarket wheel sensors that I bought, causing my car to malfunctioning .

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**Author:** ![SteveCBT](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/stevecbt/32/3192_2.png) [@SteveCBT](https://community.cartalk.com/u/SteveCBT)\
**Post date:** [September 10, 2020, 9:51am UTC](https://community.cartalk.com/t/what-happens-if-u-installed-a-wrong-o2-sensors/169794/5 "2020-09-10T09:51:33Z")

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Wheel sensors will not cause your car to malfunction. You might see the symbol for low tire pressure.

@Mustangman asked a very good question, why did you replace the O2 sensors? I assume your gas mileage has dropped, but without more information that does not lead to a diagnosis of a bad O2 sensor. What was the car doing , what symptoms did you see, was the check engine light on? If it was was were the codes, post them here, they will look like P1234

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**Author:** ![Sean-Lewis](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/sean-lewis/32/22463_2.png) [@Sean-Lewis](https://community.cartalk.com/u/Sean-Lewis)\
**Post date:** [September 10, 2020, 10:11am UTC](https://community.cartalk.com/t/what-happens-if-u-installed-a-wrong-o2-sensors/169794/6 "2020-09-10T10:11:55Z")

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Thanks bro appreciate… I will find them and send them