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#1
04-23-2010, 07:28 AM
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91 Z28 Coolant Temp Sensor Code 15
Yesterday my '91 Z28 w/5.7L TPI started throwing code 15 for coolant temp sensor.
Is this a "good" code meaning it means what it says, or is this another one of those that says one thing but seldom means actually that? Yes, I know it could be wire and not specifically the sensor, but I mean more like could it be something totally non-related? 
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#2
04-23-2010, 11:07 AM
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Re: 91 Z28 Coolant Temp Sensor Code 15
If there is a problem in the CTS circuit the ECM will run the mixture like a rich pig, this is a detrimental factor in setting fuel trim. It's cheap and easy to replace, I'd just do it.
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#3
04-23-2010, 01:15 PM
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Re: 91 Z28 Coolant Temp Sensor Code 15
I had forgotten I had a factory service manual (don't drive the car much). Did the troubleshooting checks and it is the sensor. $15 should take care of it.
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