2005 ford ranger
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2005 ford ranger
Yesterday my wifes Ranger threw a code P0128. Did a little research an looks like it could be a couple things, the most common being thermostat. So after she drove it to work today aproxx 30 miles the temp gauge was here.
So just wanna make sure I'm right by assuming its the Tstat. I don't drive her truck much but i remember it running a bit warmer than that. She said she had heat on very low but seemed to work okay (in the 50's).
So just wanna make sure I'm right by assuming its the Tstat. I don't drive her truck much but i remember it running a bit warmer than that. She said she had heat on very low but seemed to work okay (in the 50's).
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From: SW Va
The P0128 code is for the engine coolant temp sensor that sends engine temp info to the computer & its a different two wire sensor than the one wire sensor that operaters the dash gauge, which is just a reference, its not calibrated, nor does it send the computer any info.
SO, all that said, since the dash gauge is still indicating that coolant temp is still in the normal range (between the brackets) & the heater is seeming to be putting out hot air, maybe suspect a problem with the computers engine coolant sensor.
If you have a multimeter, you could measure the engine coolant temp sensor resistance when hot & cold, then compare it to the resistance specs for hot & cold temps, to see if its within range. If it is, suspect a sticking open/failing thermostat, causing over cooling & the trouble code.
Most autoparts stores have an IR temp gun that can measure various points on the engine to verify if its at the proper operating temp.
So, right now it seems to me the two wire engine coolant temp sensor, or the thermostat, belong on your suspect list. More thoughts for consideration, let us know what you find.
SO, all that said, since the dash gauge is still indicating that coolant temp is still in the normal range (between the brackets) & the heater is seeming to be putting out hot air, maybe suspect a problem with the computers engine coolant sensor.
If you have a multimeter, you could measure the engine coolant temp sensor resistance when hot & cold, then compare it to the resistance specs for hot & cold temps, to see if its within range. If it is, suspect a sticking open/failing thermostat, causing over cooling & the trouble code.
Most autoparts stores have an IR temp gun that can measure various points on the engine to verify if its at the proper operating temp.
So, right now it seems to me the two wire engine coolant temp sensor, or the thermostat, belong on your suspect list. More thoughts for consideration, let us know what you find.
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From: SW Va
The 2 wire ECT sensor is atop the engine fairly close to the upper radiator hose connect point. Look in your repair manual or repair CD, or in your local library repair manual, or they may have a subscription to something like Mitchel on Demand, or log on to Autozone for an illustration of its location for your 4.0L & if they don't have anything for your year, enter a year down to 2001, until something shows up for the SHOC model 4.0L.
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Never did get around to checking the sensor's, but she said it is barely getting into the Normal area now so im pretty sure it is stuck wide open and will be replacing it this weekend. been looking at them and there either 180 or 195, what was stock in a 4.0?
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From: SW Va
195F is the temp range & you'll want to opt for the Motorcraft thermostat, or a like one with the built in air bypass/bleed valve, to aid in getting a good cooling system burp to get all air out after refilling. When refilling, park up hill, or raise the front end so that its the high point & air will want to migrate back to the top of the radiator & be burped out & topped off by the reservoir tank. EDIT: Then start the engine & let it warm up so that the thermostat opens, then shut it off with the front end elevated & let it cool down & burp. Mark the coolant level before running the engine, then check it again after cool down, to note if collant level has dropped, if the level dropped, it burped air. Top off as necessary.
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