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P0125 on toyota t100 1996 4wd - 1998 Toyota Camry

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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

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How do you fix a code#P0125 on a 1998 toyota 4 runner?insufficient coolent temp. for closed loop control?

first check radiator level if it is full and the heater is working good make sure temp gauge is functioning c orrectly it is most likely the coolant temp sensor but if this is a high milage vehicle and you have owned long time and never changed i would also replace thermostat and check plug to temp sensor forr good conections and good wires

Apr 01, 2012 | 1998 Toyota 4Runner

1 Answer


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

My toyota engine light went on. The code reads P0125. I have changed 2 sensers already and light is still on.

That code in any toyota don't require sensor replacement, what it is is that the thermostat is not close complete or there is a small leak somewhere in your coolant system, the computer is spectating 180 or so from the moment that yo start the car to the moment that computer knows that that temp has to be reached if that don't happen because the car is loosing its temp due to a leak or a open thermostat , the computer sets p0125 unable to reach temp for close loop.

If you need further help, I’m available over the phone at

Dec 24, 2010 | Toyota ECHO Cars & Trucks

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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

My 1997 toyota corolla needs part p0125. I'm a mother of 3. can I fix this myself?

yes you can, its the engine temp switch for the computer calls for .5 labor

Mar 05, 2010 | 1996 Toyota Celica

1 Answer

1999 toyota siena p0125

The P0125 code means Coolant Temperature Insufficient for Closed Loop Operation. The P0125 "closed loop fuel control" thing is referring about your vehicle no longer being in "warm up" mode. In warm up mode you vehicle does not rely on sensors, it just follows default values for a specific length of time to warm up the engine, then it will adjust everything according to the sensors's inputs to the computer on the vehicle.
Take care

Jan 25, 2010 | 1999 Toyota Sienna

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1999 Camry 4 cyl. 104k miles, throwing codes p0125, p1130, p1135

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

Oct 15, 2009 | 1999 Toyota Camry

3 Answers

The Toyota Camry engine light is on. Error Code P0125

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

Jul 04, 2009 | 1998 Toyota Camry

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