Question about Ford F-150

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Hi, 4.2L. Check eng light On. I have a code P0125, and temp guage isn't moving off cold. I understand the code as the coolant isn't coming up to proper temp in the specified time. The coolant was at proper level. I just replaced the thermostat with a new 195deg, let the truck idle and the guage rose into the operating range. I erased the P0125 code, check eng light went off. However, the next morning the guage didn't move off cold again. BUT after 10 miles (ambient temp 80deg)I pulled over for a minute and the temp gauge started raising. Once back on the road, within 2 miles I was back to cold. At the next light, the guage rose again, but dropped once I got going. The check engine light came back on after approx 30 miles. Any suggestions? I am also confused as to where the coolant sensor is. The one I got from Napa and see on the web, a 2 wire, screw in, is nowhere to be found on my engine. ???

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  • Duane Jul 15, 2010

    Thanks Duane for your quick replies and advice.

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  • Ford Master
  • 6,826 Answers

Removal & Installation for 2000 F-150, You didn't say which year you had, so I guessed 2000 as an example:
4.2L Engine 1997-2003 To Remove:

  1. Before servicing the vehicle refer to the precautions at the beginning of this section.
  2. Remove or disconnect the following:
    • The negative battery cable NOTE: When a battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. It may be necessary to drive the vehicle 10 mi (16 km) or more.
    • Some of the coolant NOTE: Clean coolant may be collected and reused.
      ECT sensor Hi, 4.2L. Check eng light - f150_42_temp-sen.gif

    • The electrical connector
    • The ECT sensor
To Install:
  1. Install or connect the following:
    • The ECT sensor
    • The electrical connector
      1. Torque to 89 inch-lbs (10 Nm)
    • The coolant
prev.gif

Posted on Jul 13, 2010

  • 2 more comments 
  • Duane Jul 13, 2010

    Hi Duane,



    Thanks for the quick reply and guess on the year, it is actually a 99. Can you help me locate the ECT sensor? The attached picture still didn't help me. It is probably in front of my eyes, but I can't find it. Is this the only type temp sensor Ford used on the 99 4.2?



    Is removing the negative battery cable a safety precaution or does it help with resetting the computer?



    Thanks,



    Duane

  • Duane Wong
    Duane Wong Jul 13, 2010

    In general I would say it's a safety precaution to protect the computer from any surges or shorts as you poke around the engine compartment.



    Look on the cylinder head or intake manifold. I'm sorry if the pictures did not show up on Fixya.com, as I think they try to limit pictures for bandwidth issues.



    Good luck to you in this endeavour.





  • Duane Jul 13, 2010

    Thanks Duane.



    I will look again and let ya know.



    Duane

  • Duane Jul 15, 2010

    Hi Duane,



    Today I found the upper 1/2 of the sensor dangling, attached to the harness, in back of the engine. It is obvious it is broken, and the threaded 1/2 is still in the engine. The internal resister and wires are with the upper end of the sensor hooked to the harness. It appears to me that when the truck was stopped the wire would ground sending my guage's needle upwards. Once the truck was rolling the sensor would move away from the engine and the ground would be lost resulting in the needle falling. I have a head-banger of a task to locate the broken off piece of the sensor screwed somewhere in the back of the engine.



    Thanks for your help.



    Duane

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How to repair P0125 for 2000 Mercury Mountaineer


P0125 OBD-II Trouble Code Technical Description Insufficient Coolant Temperature For Closed Loop Fuel Control What does that mean? This means that the engine coolant temperature (ECT) sensor indicates that the engine has not reached the required temperature level to enter closed-loop operation within a specified amount of time after starting the engine. Symptoms You will likely not notice any drivability problems. Causes A code P0125 may mean that one or more of the following has happened: Insufficient warm up time Low engine coolant level Leaking or stuck open thermostat Faulty coolant temperature sensor Possible Solutions The simplest thing to do is to reset the code and see if it comes back. If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level). Other ECT sensor and circuit related DTCs: P0115, P0116, P0117, P0118, P0119, P0128 Register now to ask a question (free) Related P0125 DTC Discussions 1996 chevrolet Caprice p0125 Car start properly but after 5 or 10 minutes driving start doing missing and stop. After that car will not start but 20 minutes it start but again stop, if you just start the care and don?t drive it will start 24 hours with no issue but if you will go for drive than you will stuck in middle of the r... P0125 on a Saturn Sc1 My grandpa's car has a p0125 check engine light on. Tha car will not start and is running rich on fuel. We tried replacing the fuel pump and filter, fuel injectors and even the coolant temp sensor and it didn't work. What else can it be? Here's the code. P0125- closed loop fuel control insufficien... 1997 corolla engine code p0125 Im getting code p0125 in my 1997 corolla and have changed thermostat coolant temp sensor and have topped up coolant level but code keeps reappearing any sugestions would be appreciated.... 2000 4runner P0125B code Engine light came on. Local garage read code as P0125B. Internet search says engine coolant temp. sensor which I will replace. Where is it located on 3.4L engine?... camaro codes p0404 p0505 p1404 p0304 p0122 p0125 Hey I got the codes when I ran my test p0122,p0125,p0304 P0404,p0405,p1404 was wondering what's all that and the price or it better to replace the motor...

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1 Answer

P0125? O2 SENSOR, COOLANT SENSOR?


Well code 125 means the engine is not getting hot enough for the emission system to go into closed loop. So you would check the thermostat first. If the engine is reaching normal operating temp of 195 degrees there could be a problem with one of the O2 sensors or the coolant temp sensor.

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98 jaguar xj8l p0116 p0125 codes


P0116 Engine Coolant Temperature Circuit Range/Performance Problem

P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control; ECT Excessive Time to Closed Loop Fuel Control

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P0128 (and P0116) on 2006 GMC Sierra v-8, 5.3L, 4x4. Originally getting low temp readings on guage. After replacing the thermostat, the problem seemed to be fixed. A few days later, I was getting my...


P0116 - Engine Coolant Temperature (ECT) Circuit Range/Performance Problem
The ECT (Engine coolant temperature) sensor is a thermistor which changes resistance based on temperature of the coolant in contact with it. The ECT sensor will be located in the block or coolant passage. Usually it is a two wire sensor. One wire is a 5 Volt supply from the PCM (Powertrain Control Module) to the ECT. The other is a ground to the ECT.

As the temperature of the coolant changes the resistance on the signal wire changes accordingly. The PCM monitors the reading and determines coolant temperature in order to perform essential engine fuel management. When engine coolant is low, sensor resistance is high. The PCM will see a high signal voltage (low temperature). When coolant is warm, the sensor's resistance is low and the PCM will see a high temperature. The PCM expects to see slow resistance changes on the ECT signal circuit. If it sees a quick change in voltage that isn't consistent with an engine warming up, this P0116 code will set. Or if it sees a lack of change in ECT signal, this code may set.

Symptoms: There may be no noticeable symptoms if the problem is very intermittent, however the following may occur:
MIL (Malfunction Indicator Lamp) illumination
Poor drivability
Black smoke at tailpipe
Poor fuel economy
May not idle
May exhibit stalling or misfires

Causes: Potential causes of the P0116 code include:
Missing or stuck-open thermostat
Bad ECT sensor
Short or open on signal wire
Short or open on ground wire
Poor connections in wiring

Possible Solutions: If there are any other ECT sensor codes, diagnose them first.
Using a scan tool, check the ECT reading. On a cold engine, it should match the IAT reading or should be equal to ambient (outside) temperature reading. If it does match the IAT or ambient temp, check the freeze frame data on your scan tool (if equipped). The saved data should tell you what the ECT reading was when the fault occurred.

a) If the saved info indicates that the engine coolant reading was at the coldest exreme (around -30 deg. F) then that's a good indication the ECT resistance was intermittently high (unless you live in Anchorage!) Check for an open in the ECT sensor ground and signal circuits and repair as necessary. If they appear okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.

b) If the saved info indicates that the engine coolant reading was at the warmest exreme (around 250+ deg.F) then that's a good indication the ECT resistance was intermittently low. Check for a short to ground on the signal circuit and repair as necessary. If it appears okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.

Other ECT sensor and circuit related DTCs: P0115, P0117, P0118, P0119, P0125, P0128
--------------------------------------------------------------------------------------------------------------------

P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

Symptoms: You will likely not notice any drivability problems other than the MIL illumination.

Causes: A code P0128 may mean that one or more of the following has happened:
Low engine coolant level
Leaking or stuck open thermostat
Faulty cooling fan (running too much)
Faulty coolant temperature (ECT) sensor
Faulty intake air temperature (IAT) sensor

Possible Solutions: Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
Verify coolant strength & level
Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
If the above items check out good, replace the thermostat
If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code



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