# TPS questions

**URL:** <https://community.cartalk.com/t/tps-questions/174445>\
**Category:** Maintenance/Repairs\
**Tags:** subaru\
**Created:** [January 23, 2021, 8:51pm UTC](https://community.cartalk.com/t/tps-questions/174445 "2021-01-23T20:51:50Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ashton\_morris\_173275](https://avatars.discourse-cdn.com/v4/letter/a/ecae2f/32.png) [@ashton\_morris\_173275](https://community.cartalk.com/u/ashton_morris_173275)\
**Post date:** [January 23, 2021, 8:51pm UTC](https://community.cartalk.com/t/tps-questions/174445/1 "2021-01-23T20:51:50Z")

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hey everyone,

I recently replaced my Throttle position sensor and at first glance all was well, but the car started doing some weird things especially when driving for longer periods of time. I believe it is misfiring? sort of a lack of power when accelerating.  
I’ve been tinkering w the TPS position today, using a live data scan tool, and my issue is at the maximum counter clockwise postion the scan tool still shows it at 3.1% when the throttle is completely closed ( wont adjust to 0%, as ive readit should be). I made that adjustment and drove around the block and is say I got worse.  
Any insight on this? I’m having trouble finding info on this specific issue. figuring I might need to locate a voltage meter and try to go that route, or is there something I’m missing using the code scanner?

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Thanks.
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**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\
**Post date:** [January 23, 2021, 8:54pm UTC](https://community.cartalk.com/t/tps-questions/174445/2 "2021-01-23T20:54:37Z")

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What model,year,milage on your Subaru?

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**Author:** ![ashton\_morris\_173275](https://avatars.discourse-cdn.com/v4/letter/a/ecae2f/32.png) [@ashton\_morris\_173275](https://community.cartalk.com/u/ashton_morris_173275)\
**Post date:** [January 23, 2021, 9:08pm UTC](https://community.cartalk.com/t/tps-questions/174445/3 "2021-01-23T21:08:08Z")

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'04 forester almost 180k. I just needed something and it was cheap. it wasn’t having these issues before replacing the sensor.

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**Author:** ![Renegade](https://avatars.discourse-cdn.com/v4/letter/r/b4bc9f/32.png) [@Renegade](https://community.cartalk.com/u/Renegade)\
**Post date:** [January 23, 2021, 9:14pm UTC](https://community.cartalk.com/t/tps-questions/174445/4 "2021-01-23T21:14:12Z")

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What was the reason for replacing the sensor in the first place?

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [January 23, 2021, 9:46pm UTC](https://community.cartalk.com/t/tps-questions/174445/5 "2021-01-23T21:46:18Z")

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Where did you get the new sensor?  
Aftermarket parts can be a roll of the dice.

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**Author:** ![ashton\_morris\_173275](https://avatars.discourse-cdn.com/v4/letter/a/ecae2f/32.png) [@ashton\_morris\_173275](https://community.cartalk.com/u/ashton_morris_173275)\
**Post date:** [January 23, 2021, 11:35pm UTC](https://community.cartalk.com/t/tps-questions/174445/6 "2021-01-23T23:35:46Z")

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AT oil light was on, car wouldn’t start, and the codes pointed to a bad TPS. the idle air control went at the same time which seems fishy to me.