# Oxygen sensor

**URL:** <https://community.cartalk.com/t/oxygen-sensor/43311>\
**Category:** Maintenance/Repairs\
**Tags:** impreza, subaru\
**Created:** [January 27, 2010, 2:24pm UTC](https://community.cartalk.com/t/oxygen-sensor/43311 "2010-01-27T14:24:04Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![witblitz](https://avatars.discourse-cdn.com/v4/letter/w/7bcc69/32.png) [@witblitz](https://community.cartalk.com/u/witblitz)\
**Post date:** [January 27, 2010, 2:24pm UTC](https://community.cartalk.com/t/oxygen-sensor/43311/1 "2010-01-27T14:24:04Z")

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My “CHECK ENGINE” light came on and I took my car into the local repair shop. They informed me that the oxygen sensor was faulty and needed replacing at a charge of $251 plus labor of $224.  
  
 Shortly after the repair job I filled my tank with gas and discovered that a new  
  
 gas cap had been fitted.  
  
 Is there any way of determining whether the new sensor had been installed or did they just change the gas cap?

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**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\
**Post date:** [January 27, 2010, 2:39pm UTC](https://community.cartalk.com/t/oxygen-sensor/43311/2 "2010-01-27T14:39:15Z")

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Take a look at the O2 sensor. Does it look new?

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**Author:** ![witblitz](https://avatars.discourse-cdn.com/v4/letter/w/7bcc69/32.png) [@witblitz](https://community.cartalk.com/u/witblitz)\
**Post date:** [January 27, 2010, 2:44pm UTC](https://community.cartalk.com/t/oxygen-sensor/43311/3 "2010-01-27T14:44:54Z")

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Thanks for the prompt response.  
Where do I find the sensor and what does it look like?

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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:** [January 27, 2010, 2:47pm UTC](https://community.cartalk.com/t/oxygen-sensor/43311/4 "2010-01-27T14:47:12Z")

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How about make model and year of car. If I am not in error, you will find one or two near the converter. OK if I am wrong, sorry, but I have never had to fool with one.

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**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\
**Post date:** [January 27, 2010, 2:59pm UTC](https://community.cartalk.com/t/oxygen-sensor/43311/5 "2010-01-27T14:59:24Z")

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You may have to raise the car to see them. Don’t crawl under the car if it’s supported only by a jack.

There are probably two O2 sensors. They screw into the exhaust pipe, one upstream from the catalytic converter and one downstream.

They are round and have a wire coming from them.

How old is your Impreza, and how many miles on the odometer?

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**Author:** ![witblitz](https://avatars.discourse-cdn.com/v4/letter/w/7bcc69/32.png) [@witblitz](https://community.cartalk.com/u/witblitz)\
**Post date:** [January 27, 2010, 3:05pm UTC](https://community.cartalk.com/t/oxygen-sensor/43311/6 "2010-01-27T15:05:16Z")

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Thanks for the info.  
My car is a 1999 model with 134000 miles on the odometer