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  #1  
Old 10-14-2009, 04:01 PM
DBIGHAM DBIGHAM is offline
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Default PO code 128 Faulty thermostat on 2003 Max

03 Max with 132,000K. Several weeks ago I noticed a ticking sound coming from the engine, I immediately checked the oil level it was fine. However, I noticed that the coolant reservoir was nearly empty, not sure when or how that happended as I always check the drive way for any leaks. It took about a half gallon to bring the reservoir back to max level.

Today as I was driving home on the highway the SES light came on. The code is PO 128 Faulty thermostat, engine coolant level low. The coolant reservior has stayed at max level since. The temp guage has stayed in the normal range. Any suggestions on what to trouble shoot first would be greatly appericiated.
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Old 10-14-2009, 05:25 PM
infiniti master
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replace the thermostat
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  #3  
Old 10-14-2009, 05:26 PM
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NissanTech NissanTech is offline
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2004 Xterra
 
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If the coolant level is OK and there are no leaks, then the problem is most likely the thermostat. The ticking noise may not be related to the coolant system problem, but I suggest starting by changing the engine oil.
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  #4  
Old 10-14-2009, 05:28 PM
infiniti master
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low oil dont cuase that cold p011p021 if it was low on oil
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Old 10-14-2009, 05:33 PM
infiniti master
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On Board Diagnosis Logic
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Old 10-14-2009, 07:05 PM
DBIGHAM DBIGHAM is offline
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Thank you for responding so quickly. Any idea of how much it should cost and how long it takes to replace the thermostat. Also are there any other parts or services like flushing the radiator that I should consider as preventive maintenance?
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  #7  
Old 10-14-2009, 07:12 PM
infiniti master
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its about an hour rec changin coolant when u do it use factory part!!
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Old 10-14-2009, 07:32 PM
DBIGHAM DBIGHAM is offline
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Great thanks again.
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