![]() ![]() Faulty intake air temperature ( IAT) sensor.Faulty coolant temperature (ECT) sensor.If you have a good code reader, it can read live date PID's and give you values for the ECT and IAC sensorsĪ code P0128 may mean that one or more of the following has happened: If it comes back again, then I'd look into it further. I'd reset the ECU (to eliminate all stored codes) and just drive it until it comes back. Or should I have it looked at even though check engine light went off and has stayed off since Wednesday night. So do you think it is ok and I can leave it as is and not have to pay to get anything done as long as check engine light does not come back on. In extreme bitter cold like 0 to sub zero temps it can take 10-15 minutes or it will take far less if actually pushing on the gas and car moving which I think is probably normal in those super bitter cold temps, although I never got check engine light with this code when we had those super biter cold single digit to sub zero temps. It takes around 5-7 minutes in 20-30F weather for car to warm up to full operating temp after driving in stop and go traffic It has never gone past so no overheating. My car thermal gauge with the H and C always gets to the middle which means I think engine at full operating temp. It said to check coolant level and coolant level is good after I checked it. It may have been sticking or could be faulty I do not know. ![]() I did research and found it means there is some issue with the thermostat or coolant sensor regulating coolant flow or engine not warming up fast enough. I got a scanner and found 2 stored P0128 codes afterwords. Then the check engine light went off on Wednesday when I drove home from my parent's house at night and has not come back on since. Within the last week, the check engine light came on and stayed on for like 2 days. I am pretty confident that tomorrow on the drive home I should have no warning lights.I have a 2009 Ford Escape with 3L V6 engine So the Dorman finally came in last Friday and I installed it yesterday. I think that has something to do with the predicable nature of the light coming on a short time after I got up to highway speed. When the vehicle is moving, there is a 25 second delay before the instrument cluster illuminates the low coolant indicator." The shop manual says this about the low coolant light: "When the vehicle is parked, there is a two second delay before the instrument cluster illuminates the low coolant indicator. It would go on and off several times during the commute in a predicable nature. Only in the afternoon (higher ambient heat), and a short time after I got on the highway on my way home from work. In the meantime while the new part was in transit, I got to where I could predict when the light would come on. I finally settled on a Dorman replacement overflow bottle from Amazon. Needless to say, I left that one at the junkyard. So obviously that guy had the same problem and solved it by unplugging the sensor entirely. On the only one I found the plug to the sensor was disconnected. So I went to the junkyard to find a replacement. The bad part is the sensor (float switch) is not replaceable, the whole overflow bottle must be replaced with a new sensor attached. ![]() ![]() I did some research on this forum and read that it is a common problem. It freaked me out at first but I checked it several times and the coolant was obviously not low. My light low coolant light was coming on on my drive home. I fixed this problem (hopefully) the other day. I like this car and don't want to damage it by running with this light on if I could be doing harm. Is this a bad sensor or fan problem? Any suggestions would be appreciated. Finding the engine at normal temperature, I continued on my trip and then back home with everything running as normal, except the coolant warning light never went off and continues to stay on when I start the car. I have never heard the Coolant fan running so I assumed in wasn't needed or was just quiet. I drive this car back and forth to work (a distance of 5 miles each) so this was the first trip I have taken in this car greater than 10 miles. The engine temperature never went above normal and everything ran fine and normal. I stopped immediately, expecting to find low coolant levels, but they were full at normal levels. But today I was driving my family to a theme park about 50 miles away and the coolant warning light came on about 40 miles into the trip. I only recently bought this vehicle and it has been running great with no issues (except for being a gas guzzler which I pretty much expected. I live in England and have a 2002 Ford Maverick. ![]()
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