# Check Engine Light

**URL:** <https://community.cartalk.com/t/check-engine-light/33332>\
**Category:** Maintenance/Repairs\
**Tags:** mr2, engines, toyota, lights\
**Created:** [July 13, 2009, 4:33pm UTC](https://community.cartalk.com/t/check-engine-light/33332 "2009-07-13T16:33:50Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![p09626](https://avatars.discourse-cdn.com/v4/letter/p/e19b73/32.png) [@p09626](https://community.cartalk.com/u/p09626)\
**Post date:** [July 13, 2009, 4:33pm UTC](https://community.cartalk.com/t/check-engine-light/33332/1 "2009-07-13T16:33:50Z")

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Had codes read, said need 02 sensor, replaced, had codes reset, light comes back on. Tried new gas cap. Light still on.

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [July 13, 2009, 4:52pm UTC](https://community.cartalk.com/t/check-engine-light/33332/2 "2009-07-13T16:52:46Z")

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Apparently the problem isn’t with the sensor itself. It could be with the wiring to the sensor or something else. It would help us to know what the actual code(s) is.

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**Author:** ![bennyandthejets](https://avatars.discourse-cdn.com/v4/letter/b/b487fb/32.png) [@bennyandthejets](https://community.cartalk.com/u/bennyandthejets)\
**Post date:** [July 13, 2009, 10:18pm UTC](https://community.cartalk.com/t/check-engine-light/33332/3 "2009-07-13T22:18:50Z")

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I must be missing something here. You changed the gas cap when you got a code that said you have a bad O2 sensor?

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [July 13, 2009, 11:07pm UTC](https://community.cartalk.com/t/check-engine-light/33332/4 "2009-07-13T23:07:55Z")

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OK, then what did you do? This is a short story, isn’t it? "It was a dark and stormy night, and all through the house, the clock struck 10, etc."  
How’s that?

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**Author:** ![bscar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bscar/32/34_2.png) [@bscar](https://community.cartalk.com/u/bscar)\
**Post date:** [July 13, 2009, 11:34pm UTC](https://community.cartalk.com/t/check-engine-light/33332/5 "2009-07-13T23:34:26Z")

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what were the codes that came back?

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [July 14, 2009, 1:33am UTC](https://community.cartalk.com/t/check-engine-light/33332/6 "2009-07-14T01:33:51Z")

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Give us more to go on. Make model and year of car, auto or manual and what code was stored the first time and is it different now? Codes should be in the format of P1234.