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I have a 2005 pontiac grandam, the check engine light came on,it was diagnosed as code p0128.do i need a censor

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Most likely you need a new thermostat.

Posted on Nov 12, 2010

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Code p0128


As you have determined, the P0128 code is related to a low coolant temperature.

This can be one or two issues - the thermostat or the temperature sensor itself. If you're confident that the thermostat was properly replaced - you should probably look into the temperature senor itself.

Here's a video about the P0128 code diagnosing process.



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Check engine light on got a diognostic and code P0128, P0420, and P0455 popped up trying to figure out what these codes mean and what I need to fix on my car


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1 Answer

I changed engine oil on my 2005 pontiac grandam and the oil change light is still on so how do i reset it?


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1 Answer

SES light coming on. P0128 code from auto parts place. what do i do to fix this myself?


Hi, you have a faulty thermostat, so you should just need a thermostat, associated gasket (or gasket maker), and some fresh antifreeze. Consult a vehicle-specific manual for specifics on your particular engine.

More P0128 info @ http://www.obd-codes.com/p0128

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Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the Check Engine, Service Engine Soon, ABS Or TC lights to tell you that there is a problem and you should have the car diagnosed and repaired. I would take it to a service center you trust and let then come up with a solution. Sometimes a problem in one system will turn the light on for other systems that communicate with it, but it doesn't mean there is a problem in all of the systems.

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