Question about 2006 Chevrolet Trailblazer

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PO442 COOLANT TEMP

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  • Chevrolet Master
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Here's a link to your code Fay. P0442 OBD II Trouble Code

Posted on Apr 02, 2014

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Posted on Jan 02, 2017

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Is the cylnder head temp sensor and the cooliant temp sensor the same thing on a 2004 Lincoln ls 6 cyndler? Can't find the cooliant temp sensor everything redirects to cylnder head temp sensor even at...


cylinder head temp sensor measures the temp of the cylinder head metal itself and the coolant sensor measures the temp of the coolant only. the coolant sensor is mounted in the coolant and the head sensor is mounted only in the metal of the head and not into anything else. check with a dealer.

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Check engine light on. Won't stay off. OCD code is po442 po128 coolant.


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If that's the case, I strongly suggest that you replace the coolant temp sensor. Looks like it's faulty and grounding the circuit. The car's computer can detect it that's why it won't start but once you disconnect it, it will for the coolant sensor is bypassed.

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I have 3 codes, p1189 ,p0128 and po442 . looking for what thay mean. 2002 alero.


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Jan 07, 2011 | Oldsmobile Alero Cars & Trucks

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Check engine light is on. error reads PO128 and


hi 128 is coolant temp below regulating temp 405 is










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hi 128 is coolant is below regulating temp 405 is<erg/swsr/ckt low> hope this helps please rate this answer












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Getting a low coolant temp code.temp is normal. im


Sometimes there are two Temp sensors. Did you see if you had two?

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Coolant doesn't heat up!


the temp sensor just tells you the temp of the coolant and it controlls the coolant fan to turn on and off at a certain temperature........have you check for coolant leeaks???

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Diagnostic code PO442


PO442 is an Evaporation Emission leak. It's probably a loose gas cap. The fix would be $96.00 at our dealership, since your truck is out of warranty. You may be able to get it fixed cheaper, but you'll be charged a diagnostic fee.

Jun 24, 2008 | 2002 Mazda Protege

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