"the servicing was low, so I serviced it back up"
What does that mean? The code indicates the coolant isn't getting up to normal temperature in a certain amount of time. You might also be getting air from the heater that isn't as hot as normal. This would indicate a thermostat that is opening too soon or is stuck open.
When the engine isn't hot enough, fuel vaporizes poorly so some of it doesn't burn in the engine. This increases emissions and decreases fuel mileage.
To check this yourself, start the engine when it is cool and remove the radiator cap. Stick a thermometer in the coolant to measure its temperature when it starts to circulate. It should be around 190 degrees. If it is significantly lower, pinch the upper radiator hose for a minute, then see if the temperature goes up when you release the hose. If it does, suspect the thermostat.
If the coolant is already above 190 degrees, suspect the coolant temperature sensor.
Thursday, March 18th, 2010 AT 8:03 PM