P0125? O2 SENSOR, COOLANT SENSOR?

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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change coolent temp sensor.

The code means the engine is not reaching normal operating temp.
You would need to use a scanner to see what the temp sensor is telling the computer the coolant temp is.
If the coolant temp sensor is showing 180 degrees or more after 5 min of run time, the problem could be the computer.

DTC P0125 OBD-II - Insufficient Coolant Temperature For Closed Loop Fuel Control
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. 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


DTC P0135 OBD-II - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135. You will likely notice poor fuel economy the illumination of the MIL.

A code P0135 may mean that one or more of the following has happened:
O2 Heater element resistance is high
Internal short or open in the heater element
O2 heater circuit wiring high resistance
open or short to ground in the wiring harness


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Whenever i get this code i like to clear it and see if it returns. Sometimes in extreme cold weather conditions it will set this code and there may not be anything wrong. What motor is in your celica?

P0125- Engine not reaching operation temp quick enough. Possible problems:

• Insufficient warm up time
• Low engine coolant level
• Leaking or stuck open thermostat
• Faulty coolant temp sensor
• P1130- A/F Sensor Circuit Range/performance, Bank 1 Sensor 1

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.

Change bank 1 sensor 1 this will solve your problem. Tihs is a fuel issue nit a thermostat issue.

Hi,

The p0125 code is an oxygen sensor code, the description will say something like" insufficient coolant temp for closed loop operation" the problem is not the coolant temp sensor, the problem is that the signal from the O2 sensor is not within the parameters that the computer needs to go into a closed loop condition, more than likely replacing the O2 sensor will take care of the problem but only if there is not another problem with the engine such as a misfire, vacuum leak or a mechanical problem, from what you've said this doesn't seem to be the case, so before spending a lot of time diagnosing replace the sensor.

Thanks.

I have to tell this: Your dealer screwed up. The P-0171 remedy was to clean the Mass Air Flow Sensor, NOT replace an O2 sensor. The P-0125 indicates that you have the insufficient coolant temp, which is a thermostat sticking open. This is why your idle is so high, the coolant is not up to operating temperature, 192 degrees F...Clean the MAF and replace the thermostat, and tell the dealer that he screwed up on the O2 sensor diagnosis/replacement. They put an O2 on for no reason. Better yet, have THEM clean the MAF and replace the thermostat. They owe you that much.