# Toyota Camry P0128

**URL:** <https://community.cartalk.com/t/toyota-camry-p0128/119588>\
**Category:** Maintenance/Repairs\
**Tags:** toyota, camry\
**Created:** [June 21, 2018, 8:12pm UTC](https://community.cartalk.com/t/toyota-camry-p0128/119588 "2018-06-21T20:12:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mleich](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mleich](https://community.cartalk.com/u/mleich)\
**Post date:** [June 21, 2018, 8:12pm UTC](https://community.cartalk.com/t/toyota-camry-p0128/119588/1 "2018-06-21T20:12:59Z")

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Hello again Car Talk folks.  
I still have my 2001 Camry 4 cylinder and it is going strong with only 134,000 miles. Check engine light gives code P0128. I have noticed that the dash temperature gauge reads slightly lower than it usually does when the engine is hot.  
Should I replace the coolant temperature sensor first?  
Do I need a genuine Toyota sensor?  
Would the thermostat have been replaced when I had the timing belt and water pump done about 3 years ago?  
Or do I replace it only if a new coolant temp sensor does not fix the problem?

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**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:** [June 21, 2018, 8:21pm UTC](https://community.cartalk.com/t/toyota-camry-p0128/119588/2 "2018-06-21T20:21:21Z")

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This code is usually caused by a thermostat that’s stuck partially open

Replace the thermostat.

Tester

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**Author:** ![mleich](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mleich](https://community.cartalk.com/u/mleich)\
**Post date:** [June 21, 2018, 8:42pm UTC](https://community.cartalk.com/t/toyota-camry-p0128/119588/3 "2018-06-21T20:42:36Z")

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Should I do the CT sensor as well, or just the thermostat? Thank you, Tester.

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**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:** [June 21, 2018, 8:47pm UTC](https://community.cartalk.com/t/toyota-camry-p0128/119588/4 "2018-06-21T20:47:19Z")

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Just replace the thermostat.

Tester