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V40 Fault Code P0128 S40-V40 2000

posted by  Bob_V40 on  Thu Aug 4 02:19 CST 2005
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Hi,
My wife recently took her V40 in to be smoged. It failed due to a "P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)" error.
I replaced the thermostat and with my computer, cleared the codes. I turned of the car and then restarted it. The fault code reappeared. What else could it be???
Thank you
Bob








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    V40 Fault Code P0128 S40-V40 2000

    posted by  someone claiming to be Ed Gosselin on  Mon Aug 15 14:02 CST 2005 [RELATED]

    It may be your ETC sensor that is right below where you changed the thermostat. I have a S40 2001 and had to change mine as well. If you have a scanner that displays live data you can check the temperature. Try a laser thermometer to verify the temp.

    Ed







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    V40 Fault Code P0128 S40-V40 2000

    posted by  someone claiming to be Miker on  Thu Aug 4 11:23 CST 2005 [RELATED]

    Bob

    Cycle temperature sensor connector on the thermostat housing. easiest

    Clean temperature sensor in the thermostat housing. Next difficult

    or, replace the sensor.

    Miker







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