# Code P1141 - Downstream 02 Sensor - Please help!

**URL:** <https://community.cartalk.com/t/code-p1141-downstream-02-sensor-please-help/104306>\
**Category:** Maintenance/Repairs\
**Tags:** protege, mazda\
**Created:** [May 24, 2017, 9:21pm UTC](https://community.cartalk.com/t/code-p1141-downstream-02-sensor-please-help/104306 "2017-05-24T21:21:24Z")\
**Posts on this page:** 4\
**Page:** 5

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**Author:** ![mazda\_protege](https://avatars.discourse-cdn.com/v4/letter/m/dc4da7/32.png) [@mazda\_protege](https://community.cartalk.com/u/mazda_protege)\
**Post date:** [May 31, 2018, 11:14pm UTC](https://community.cartalk.com/t/code-p1141-downstream-02-sensor-please-help/104306/84 "2018-05-31T23:14:47Z")

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and how do you know it is the 02 sensor? lol

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**Author:** ![mazda\_protege](https://avatars.discourse-cdn.com/v4/letter/m/dc4da7/32.png) [@mazda\_protege](https://community.cartalk.com/u/mazda_protege)\
**Post date:** [May 31, 2018, 11:25pm UTC](https://community.cartalk.com/t/code-p1141-downstream-02-sensor-please-help/104306/85 "2018-05-31T23:25:33Z")

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The car has 244000km (180miles?), I will sell it at 280k (but it would be fun to drive it until it completely passes out and dies).

Rust around the window frame, and like most mazdas rust around the wheel arches.

So as I mentioned earlier, I am not going to spend on any part it does not _need_

I am contemplating whether I should just leave the 02 sensor in there?

Since it still functions, ie giving out 13ohms…if it was completely broken it would read open circuit right?

@Nevada_545 @thegreendrag0n

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [June 1, 2018, 2:13am UTC](https://community.cartalk.com/t/code-p1141-downstream-02-sensor-please-help/104306/86 "2018-06-01T02:13:04Z")

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> [@mazda\_protege](#):
>
> if it was completely broken it would read open circuit right?

It might be going open circuit or dead short when it heats up.

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**Author:** ![thegreendrag0n](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thegreendrag0n/32/9265_2.png) [@thegreendrag0n](https://community.cartalk.com/u/thegreendrag0n)\
**Post date:** [June 1, 2018, 5:17pm UTC](https://community.cartalk.com/t/code-p1141-downstream-02-sensor-please-help/104306/87 "2018-06-01T17:17:04Z")

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> [@mazda\_protege](#):
>
> Since it still functions, ie giving out 13ohms…if it was completely broken it would read open circuit right?

In message 59 above, you posted:

> [@mazda\_protege](#):
>
> The Autozone site says:
> 
> "Heater Circuit  
> Specific to:
> 
> Mazda Protege 1999-2003
> 
> Disconnect the HO2S connector.  
> Measure the resistance between the HO2S terminals C and D. Standard value:  
> Front sensor-3.0-3.6 ohms  
> Rear sensor-5.0-7.0 ohms
> 
> If not as specified, replace the HO2S

5-7 and 13… hm… must be quite a difference

your sensor costs $15, just replace it and go from there - you’ve already spent more on fidling around

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