# Check Engine Light comes on when car fully warms up....
**URL:** https://forums.speedlife.net/t/check-engine-light-comes-on-when-car-fully-warms-up/25463
**Category:** NYSpeed Automotive
**Created:** [March 5, 2007, 12:38pm UTC](https://forums.speedlife.net/t/check-engine-light-comes-on-when-car-fully-warms-up/25463 "2007-03-05T12:38:06Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@SilverGT](https://forums.speedlife.net/u/SilverGT)
#### Post date: [March 5, 2007, 12:38pm UTC](https://forums.speedlife.net/t/check-engine-light-comes-on-when-car-fully-warms-up/25463/1 "2007-03-05T12:38:06Z")
the wiring on this pickup seems a little weird
the car is a 1991 chevrolet s10 pickup, 2wd,4.3l automatic.
The car runs and drives fine without a problem but when the car is at its normal operating temperature a little below half 210 degree it throws the check engine light, and it stays on, it only happens when its at normal temperature,
i was thinking the wiring was wired up wrong can that be it? if so what should i look for?
what turns on when the car is at normal operating temperature?
The fan? can it be grounded at the thermostat?
It only a distraction to me worst come to worst i;ll tape it off lol and dont see it.
but i would like to solve the problem first. thanks
It does not overheat either.
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### Author:  [@ieatpaint](https://forums.speedlife.net/u/ieatpaint)
#### Post date: [March 5, 2007, 3:28pm UTC](https://forums.speedlife.net/t/check-engine-light-comes-on-when-car-fully-warms-up/25463/2 "2007-03-05T15:28:42Z")
heated oxygen sensor is my guess.
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### Author:  [@SilverGT](https://forums.speedlife.net/u/SilverGT)
#### Post date: [March 5, 2007, 7:19pm UTC](https://forums.speedlife.net/t/check-engine-light-comes-on-when-car-fully-warms-up/25463/3 "2007-03-05T19:19:44Z")
should i just change it?
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### Author:  [@nitroinsane](https://forums.speedlife.net/u/nitroinsane)
#### Post date: [March 5, 2007, 7:55pm UTC](https://forums.speedlife.net/t/check-engine-light-comes-on-when-car-fully-warms-up/25463/4 "2007-03-05T19:55:35Z")
dont guess get the fucking code read its a obd 1 u can buy the 10 dollar code reader. dont throw parts at something u will end up spending a fortune on nothing
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### Author:  [@sickmach](https://forums.speedlife.net/u/sickmach)
#### Post date: [March 5, 2007, 9:21pm UTC](https://forums.speedlife.net/t/check-engine-light-comes-on-when-car-fully-warms-up/25463/5 "2007-03-05T21:21:58Z")
advance auto can read your obd1 system bring it down to abbott and ridge