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Old 08-29-2010, 05:36 PM
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PO128 OBD-II trouble

My mother wasn't too bright and poured oil in the coolant reservoir, i flushed it out 4 times and siphoned the oil on the top out about a week later. My code reader says http://www.obd-codes.com/p0128 Could the sensor go bad after that happened? Her car is a 2004 Saturn Vue with almost 60k miles.
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Last edited by 79z28; 08-29-2010 at 05:52 PM.
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Old 08-29-2010, 07:21 PM
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well it happens. The code p0128 is described as " coolant temp too low for run time elapsed" basically means that the engine did not warm up fast enough for the engine to complete all its monitors and go into closed loop in time required.Maybe it isnt warming up at all. I would pull the sensor out and see if a load of schmeg comes out of it location in the cooling system . I would think that oil coolant mix (schmeg) would not transfer heat to the sensor.
It may also be just an air pocket that is stubborn and doesnt wanna go away.
Before you go through all that begin with the engine cold then clear the code and then drive it for a little while say 10-15 minutes. then put the scanner back on it and look at pending (or one trip) codes to see if it comes back.A lot of codes take 50 drives cycles to reset.

Last edited by latech; 08-29-2010 at 07:30 PM.
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Old 08-29-2010, 08:06 PM
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I doubt there's any damage to the sensor from what you describe. Check you're thermostat, some fail in the open position, not allowing full warm up.
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Last edited by 68NovaSS; 08-29-2010 at 08:38 PM.
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