# Service engine soon light

**URL:** <https://community.cartalk.com/t/service-engine-soon-light/37700>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, venture, engines, lights\
**Created:** [October 6, 2009, 5:48pm UTC](https://community.cartalk.com/t/service-engine-soon-light/37700 "2009-10-06T17:48:05Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![carrie91](https://avatars.discourse-cdn.com/v4/letter/c/58956e/32.png) [@carrie91](https://community.cartalk.com/u/carrie91)\
**Post date:** [October 6, 2009, 5:48pm UTC](https://community.cartalk.com/t/service-engine-soon-light/37700/1 "2009-10-06T17:48:05Z")

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Could the malfunction of the thermostat cause the service engine light to come on?

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [October 6, 2009, 6:54pm UTC](https://community.cartalk.com/t/service-engine-soon-light/37700/2 "2009-10-06T18:54:16Z")

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Yes - but there’s no need to guess. Go to a chain auto parts store such as Autozone and ask them to pull the codes. Write down the exact codes (P-numbers in the form Pxxxx) and post them.

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**Author:** ![carrie91](https://avatars.discourse-cdn.com/v4/letter/c/58956e/32.png) [@carrie91](https://community.cartalk.com/u/carrie91)\
**Post date:** [October 13, 2009, 11:19pm UTC](https://community.cartalk.com/t/service-engine-soon-light/37700/3 "2009-10-13T23:19:07Z")

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I went to auto zone. Here is the code P0128. i HOPE YOU CAN HELP.

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**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [October 13, 2009, 11:38pm UTC](https://community.cartalk.com/t/service-engine-soon-light/37700/4 "2009-10-13T23:38:18Z")

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Yes. If the ECU thinks the engine is still cool it’ll keep the mix too rich.  
And yes, P0128 is the code for your temp sensor.

The temp sensor output can be tested.

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [October 14, 2009, 2:01am UTC](https://community.cartalk.com/t/service-engine-soon-light/37700/5 "2009-10-14T02:01:35Z")

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Have a look at this: [http://www.obd-codes.com/p0128](http://www.obd-codes.com/p0128)

Checking much of this isn’t beyond the reach of someone with some basic knowledge - especially if armed with a repair manual for the car.