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#4633754 - 01/13/18 03:15 PM 2006 Civic EX P0128 Code?
maverickfhs Offline


Registered: 12/28/16
Posts: 2006
Loc: VA
So today I was driving down the road and CEL came on my 06 Civic EX, after scanning the code it's P0128.

Usually temperature gauge on the ODO shows 3-4 dots on the highway and they rise once I am in stop and go traffic.

I think thermostat is stuck open and needs to be replaced. Anyone has any other ideas or advice? Thanks very much thumbsup
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2006 Civic EX 200K/AT
2006 Acura TSX 177K/AT

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#4633789 - 01/13/18 03:48 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
Warstud Online   content


Registered: 09/02/05
Posts: 5402
Loc: MIchigan
Yep...Time to change the T-Stat.

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#4633790 - 01/13/18 03:48 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
GMBoy Offline


Registered: 11/22/04
Posts: 7705
Loc: Texas
Replacing the thermostat is exactly what you need to do in 99% of the cases with a P0128. The ECM has sensed that the car is not to operating temp in a given amount of time and you've proved it with the gauge.

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#4633880 - 01/13/18 05:40 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
ARB1977 Offline


Registered: 06/12/05
Posts: 5168
Loc: North Texas
Originally Posted By: maverickfhs
So today I was driving down the road and CEL came on my 06 Civic EX, after scanning the code it's P0128.

Usually temperature gauge on the ODO shows 3-4 dots on the highway and they rise once I am in stop and go traffic.

I think thermostat is stuck open and needs to be replaced. Anyone has any other ideas or advice? Thanks very much thumbsup

How many miles on your civic?
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2015 Tacoma 4.0L 60K (as of 02/23/18)
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2018 CRV 1.5L (as of 05/11/18)
Factory fill / Factory filter

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#4633919 - 01/13/18 06:25 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2006
Loc: VA
Currently 198k
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2006 Civic EX 200K/AT
2006 Acura TSX 177K/AT

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#4633927 - 01/13/18 06:30 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Definitely time. Get OEM only.
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#4633932 - 01/13/18 06:36 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2006
Loc: VA
Planning to go OEM. Could there be any other issue with software or sending sensor unit? Thank you.
_________________________
2006 Civic EX 200K/AT
2006 Acura TSX 177K/AT

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#4633936 - 01/13/18 06:43 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
I suppose but at that mileage, it sounds like the tstat is about worn out. Maybe if you had just replaced the tstat and still had that code maybe it's the coolant temp sensor.
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15 Jeep KL Limited V6: Formula Shell 5W20
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96 Jeep XJ Country: STP HM 5W30 (winter)

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#4634037 - 01/13/18 09:16 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2006
Loc: VA
Not sure why 2 part numbers? https://www.hondapartsnow.com/oem-honda-thermostat.html?Vin=2HGFG12896H575234&Filter=()
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2006 Civic EX 200K/AT
2006 Acura TSX 177K/AT

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#4634065 - 01/13/18 09:51 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
Warstud Online   content


Registered: 09/02/05
Posts: 5402
Loc: MIchigan
Ones made by Fuji Seiko the other is a Nippon

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#4634068 - 01/13/18 09:53 PM Re: 2006 Civic EX P0128 Code? [Re: Warstud]
maverickfhs Offline


Registered: 12/28/16
Posts: 2006
Loc: VA
Originally Posted By: Warstud
Ones made by Fuji Seiko the other is a Nippon


Thanks, interesting on the web page it says both made by Fuji.
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2006 Civic EX 200K/AT
2006 Acura TSX 177K/AT

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#4634069 - 01/13/18 09:55 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2006
Loc: VA
Planning to buy https://www.amazon.com/gp/offer-listing/...p;condition=new OR

https://www.ebay.com/itm/Genuine-OEM-Honda-Civic-Thermostat-w-Gasket-2007-15-EXC-Si-Hy-19301-RNA-315/112645816375?hash=item1a3a36c037:g:uDkAAOSwldRaD2Jm:sc:USPSFirstClass!20109!US!-1&vxp=mtr
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2006 Civic EX 200K/AT
2006 Acura TSX 177K/AT

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#4634131 - 01/13/18 11:36 PM Re: 2006 Civic EX P0128 Code? [Re: maverickfhs]
Marco620 Offline


Registered: 02/25/14
Posts: 2188
Loc: Deplorable Kansan,HK fan!
If the fuel economy is tanking and the exhaust is running rich its 02
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