# Running weird

**URL:** <https://community.cartalk.com/t/running-weird/169864>\
**Category:** Maintenance/Repairs\
**Tags:** focus, ford\
**Created:** [September 12, 2020, 8:19pm UTC](https://community.cartalk.com/t/running-weird/169864 "2020-09-12T20:19:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![David-505](https://avatars.discourse-cdn.com/v4/letter/d/848f3c/32.png) [@David-505](https://community.cartalk.com/u/David-505)\
**Post date:** [September 12, 2020, 8:19pm UTC](https://community.cartalk.com/t/running-weird/169864/1 "2020-09-12T20:19:33Z")

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So at some point the rpm will catch up and meet with the speed. When I drive, around 60mph the rpm is at 3500. At 55mph it’s at 3000 rpm. At 45mph it’s at 2500 rpm. Etc.

Here’s a link to the video

[![](https://global.discourse-cdn.com/cartalk/original/3X/5/6/562369f3b00d604c54230cc634f2824c1bfa7f6a.jpeg "my car is running weird") ](https://www.youtube.com/watch?v=-5Ht54H-lto)

It gives me a p0171 code. Which means oxygen bank 1 too lean. But could it have a faulty transmission?

Ford focus 2010 automatic transmission

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [September 13, 2020, 6:26am UTC](https://community.cartalk.com/t/running-weird/169864/2 "2020-09-13T06:26:27Z")

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It seems that the PCM will not allow high gear due to the engine malfunction. Correct the oxygen failure before replacing the transmission.