# O2 sensor question **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** subaru\ **Created:** [August 1, 2019, 10:48pm UTC](https://community.cartalk.com/t/o2-sensor-question/145769 "2019-08-01T22:48:59Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Jason\_Scheel](https://avatars.discourse-cdn.com/v4/letter/j/b2d939/32.png) [@Jason\_Scheel](https://community.cartalk.com/u/Jason_Scheel)\ **Post date:** [August 1, 2019, 10:48pm UTC](https://community.cartalk.com/t/o2-sensor-question/145769/1 "2019-08-01T22:48:59Z")
Question: I took my Subaru to get smogged. Didn’t pass the said up stream o2 sensor. So I replaced it and took back in for smog. Didn’t pass again same problem ---
**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\ **Post date:** [August 1, 2019, 10:57pm UTC](https://community.cartalk.com/t/o2-sensor-question/145769/2 "2019-08-01T22:57:06Z")
Another case of shooting the messenger, Your o2 sensor was probably working correctly and telling you that there is a problem with the engine. We need the code(s) that the o2 sensor is giving. P0XXX ---
**Author:** ![Jason\_Scheel](https://avatars.discourse-cdn.com/v4/letter/j/b2d939/32.png) [@Jason\_Scheel](https://community.cartalk.com/u/Jason_Scheel)\ **Post date:** [August 1, 2019, 11:00pm UTC](https://community.cartalk.com/t/o2-sensor-question/145769/3 "2019-08-01T23:00:19Z")
Replace B1 S1 O2 sensor so ECU monitors will run. That’s I have here ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [August 1, 2019, 11:48pm UTC](https://community.cartalk.com/t/o2-sensor-question/145769/4 "2019-08-01T23:48:12Z")
If you’re not in Calfornia or Hawaii you need to get a parts store such as AutoZone to do a quick scan and provide you the exact code. As you have discovered, setting an O2 code does not mean the problem is the O2 sensor. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [August 1, 2019, 11:53pm UTC](https://community.cartalk.com/t/o2-sensor-question/145769/5 "2019-08-01T23:53:57Z")
The vehicle probably hasn’t been driven enough to reset the readiness monitors. Until that’s done, the vehicle won’t pass the emission test. [https://repairpal.com/how-to-perform-a-basic-drive-cycle](https://repairpal.com/how-to-perform-a-basic-drive-cycle) Tester ---
**Author:** ![Jason\_Scheel](https://avatars.discourse-cdn.com/v4/letter/j/b2d939/32.png) [@Jason\_Scheel](https://community.cartalk.com/u/Jason_Scheel)\ **Post date:** [August 2, 2019, 1:19am UTC](https://community.cartalk.com/t/o2-sensor-question/145769/6 "2019-08-02T01:19:12Z")
Code P0065 ---
**Author:** ![Jason\_Scheel](https://avatars.discourse-cdn.com/v4/letter/j/b2d939/32.png) [@Jason\_Scheel](https://community.cartalk.com/u/Jason_Scheel)\ **Post date:** [August 2, 2019, 1:21am UTC](https://community.cartalk.com/t/o2-sensor-question/145769/7 "2019-08-02T01:21:02Z")
I drove it 30 miles ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [August 2, 2019, 1:25am UTC](https://community.cartalk.com/t/o2-sensor-question/145769/8 "2019-08-02T01:25:53Z")
Tester ---
**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:** [August 2, 2019, 3:12am UTC](https://community.cartalk.com/t/o2-sensor-question/145769/9 "2019-08-02T03:12:17Z")
Model , year, and engine of your Subaru? P0065 isn’t an O2 sensor code. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [August 2, 2019, 7:51am UTC](https://community.cartalk.com/t/o2-sensor-question/145769/10 "2019-08-02T07:51:56Z")
Well there you have it, blocked hose, bad valve, or get the computer reflashed. But at least you got a new sensor out of the deal. ---
**Author:** ![Jason\_Scheel](https://avatars.discourse-cdn.com/v4/letter/j/b2d939/32.png) [@Jason\_Scheel](https://community.cartalk.com/u/Jason_Scheel)\ **Post date:** [August 16, 2019, 9:29pm UTC](https://community.cartalk.com/t/o2-sensor-question/145769/11 "2019-08-16T21:29:06Z")
Ya got new valve, hoses are good. Now to see how much to flash computer. Thank you everyone