Check engine light-code 0125- already change sensor , thermostat and coolant level- now the temp needle keeps going up and down but car is not overheating. 1999 toyota corolla

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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Code P 0125 indicates insufficient coolant temp to enter closed loop operation. Most likely cause is either engine is not warming up (stuck thermostat) or more likely bad coolant temp sensor is making computer think engine is not warm and thus sends excess fuel injector pulse making engine run rich. Very common problem which kills gas mileage and may make car run poorly. Easy part to test or just change.

they refer to the air/fuel sensor circuit and air/fuel heater circuit , the 0125 code refers to engine not getting to operating temperature , so that is why the other two codes are read , check coolant level, if ok check that the thermostat is opening , if it is then you may have an air lock in the coolant system so bleed the system , whilst bleeding get someone to switch the heater temp switch to hot and back to cold a few times as thats where an air lock could easily get trapped

not the pump but air in the system or a broken wire to the coolant level sensor
that sensor at the top of the radiator tank has to be completely immersed in coolant or the circuit is broken and the light comes on
same effect id the wire to that sensor is broken in the insulation

Are you asking about OBD code? P0125 fault code?

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.

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).

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Hello good fixya answer seeker

That code basically means the cars coolant temp is under what the thermostat is supposed to keep it at. There are a few things that can cause this issue i shall list them below for you.

1. low coolant level
2. bad thermostat
3. bad coolant temp sensor (sits in the side of the block most of the time)

All of the above are easy to change and cheap first off check the coolant level when car is cold only if that's good change thermostat and gasket cheap and easy if that don't correct the issue change the coolant temp sensor this tells fan when to run and reports temps to Gage.

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A code P0128 may mean that one or more of the following has happened:

1-Low engine coolant level
2-Leaking or stuck open thermostat
3-Faulty cooling fan (running too much)
4-Faulty coolant temperature (ECT) sensor
5-Faulty intake air temperature (IAT) sensor

Check coolant level Check to make sure thermostat is functioning properly Check the Cooling fan Check the ECT sensor Check the IAT sensor If all else fails replace the thermostat

Don't fool with the sensor.
Your thermostat is staying open too long. The code tells me this. Replace the thermostat, and you will be fine.

this is whats going on insufficient warm up time / low engine coolant /check coolant/ leaking or stuck thermostat or faulty tep sensor

Sounds as if the car is not getting warm enough, which could mean that your thermostat is stuck in the open position. Try changing it. That should take care of the problem. Depending on which brand you get, the thermostat will most likely cost you between $8.00-$16.00.

Also, check the coolant level. Make sure its at a proper level. The Temperature Sensor could be bad as well.