Question about 2003 Toyota Corolla

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Check engine light on P0125

So ive had my 2003 corolla a little less than a month now. and the check engine light came on. i took it back to the dealer and they came back with a code p0171 so they replaced my o2sensor. I drove it about 45 miled and the light came on again!!! Now the code is a p0125! also when I am in park the idle is around 1800 then drops down to 850 when in reverse or drive. Did I buy a lemon?? please help!

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THANKS TOYOTA ED!!!! UR A LIFESAVER!!!

Posted on Oct 14, 2008

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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.

Posted on Oct 14, 2008

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SOURCE: 03 toyota corolla engine light on again!

Without seeing your vehicle on my scan tool, it is hard to see what is exactly going on.
But, please allow me to share the following info with you:
The P-0171 code relates to the Mass Airflow Sensor. This is a VERY common code with the Corolla product.Your dealer *** should *** have inspected it for dirt contamination, and cleaned it, if it was indeed dirty.
Secondly, The P-0125 relates to Oxygen Sensor number ONE. If your dealer replaced the wrong sensor; (#2), you can expect to have problems.
My advice: unplug, remove, inspect & clean the MAF sensor. Ensure that the air filter is clean.
This should help you quite a bit.

Posted on Oct 13, 2008

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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...

Read more at: http://www.obd-codes.com/p0125
Copyright © OBD-Codes.com

May 18, 2015 | 2000 Mercury Mountaineer

1 Answer

Corolla, 1999, P0125


P0125 TOYOTA - Insufficient Coolant Temperature for Closed Loop Fuel Control

Possible causes- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection

Oct 14, 2012 | 2001 Toyota Corolla

1 Answer

P0125


P0125 indicates engine temperature too low to go into closed loop. The 1st thing I'd check is the thermostat.

Mar 08, 2012 | 1997 Toyota Corolla

1 Answer

Had OBD2 codes P0441 & P0446 on my 1999 Toyota Corolla. Replaced the VSV CHARCOAL EVAPORATORE, disconnected the battery, check engine light went out. came back on this am, took the car to advanced auto...


According to my 2002 Toyota Tundra manual (and it may be different for your car) P0125 is as follows:
Insufficient Coolant Temperature
for Closed Loop Fuel Control

This would seem unrelated to your original problem.

Aug 22, 2010 | 1999 Toyota Corolla

1 Answer

A rattling noise from the engine bay


Check the heat shields on the exhaust system. They get loose from the extreme heat fluctuations work loose and rattle. Especially the one between the engine and firewall where the 02 sensor screws in. It probably rattles less after warm up because heat causes expansion which makes it tighter. Hope this helps.

Apr 05, 2009 | 2003 Toyota Corolla

1 Answer

03 toyota corolla engine light on again!


Without seeing your vehicle on my scan tool, it is hard to see what is exactly going on.
But, please allow me to share the following info with you:
The P-0171 code relates to the Mass Airflow Sensor. This is a VERY common code with the Corolla product.Your dealer *** should *** have inspected it for dirt contamination, and cleaned it, if it was indeed dirty.
Secondly, The P-0125 relates to Oxygen Sensor number ONE. If your dealer replaced the wrong sensor; (#2), you can expect to have problems.
My advice: unplug, remove, inspect & clean the MAF sensor. Ensure that the air filter is clean.
This should help you quite a bit.

Oct 12, 2008 | 2000 Toyota Corolla

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