Question about 2000 Mitsubishi Montero Sport

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Engine temp not hot enough for closed loop. which sensor? how to check the sensor.

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  • tgariano Jul 31, 2009

    seems to have been a pinched wire on bank 2 number 1 o2 sensor.


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Its usually the thermostat that needs to be replaced. Its sticking open.

Posted on Jul 30, 2009

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1999 nissan maxima idles rough when engine warms up and more prominent during summer months. no service warning light indicates the condition.what could be the cause?

May need to have the engine coolant temp sensor checked. It normally does not set a fault code but does send signal for fuel control until the engine warms up enough to enter closed loop fuel control.

Nov 04, 2014 | 1999 Nissan Maxima

1 Answer


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.

Aug 06, 2014 | 1998 Lexus Gs 300

1 Answer

1996 vw 2.0 aba starts runs great for about 15min then goes into a rough idle and dies almost like its not getting enough gas ?

Does the car have any check engine codes? Usually if the car runs poorly when warmed up, its because the computer tries to put the car into "closed loop mode" when it's up to operating temp but something is wrong. When engine is cold, the ECU uses the coolant temp sensor to adjust fuel mixture, when warm, it switches to O2 sensor and monitors other systems like EGR, etc. In my experience I've seen this be anything from O2 sensor, coolant temp sensor, or EGR valve. Could be a dirty throttle body too, as this is a common issue on the ABA engine.

Apr 08, 2014 | 1996 Volkswagen Jetta

1 Answer

Car is acting like it wants to die after a little drive

There are many sensors that could cause run ability problems when the car is in closed loop (warm) check coolant temp sensor, map sensor, maf sensor, throttle position sensor is the check engine light on? If so have the codes read this will give you a good place to start looking, remember the codes are general ideas where to check so for example the coolant temp sensor can be tested cold and again hot to see I'd it is measuring temperature properly if not replace it if it is fine and it was a ect code follow the wires inspect them and check resistance to be sure the wire doesn't have a fault, and check sensors that operate on voltage to make sure they are receiving enough voltage to operate

Oct 15, 2012 | 2001 Ford Mustang

1 Answer

Ford explorer sportrac evap and catalyst not ready problem how to fix it?

One possible issue is a faulty thermostat. If the engine is not getting up to normal temp the emissions system will not go into closed loop.
I know its hot in Nevada now so thats just a suggestion.
The O2 sensors have heaters to make the exhaust gas hot quick so that the sensors can work.
Is the check engine light coming on - or is it just that the exhaust gas is not hot enough for the test equipment ?

Aug 09, 2012 | 2002 Ford Explorer

1 Answer

2005 dodge ram 1500 hemi. will set code 0132 when starting only some times. O2 replaced both sides.

Try changing the coolant temp sensor, it determines when the ECU shifts from open loop (cold) to closed loop(hot)

May 29, 2017 | Dodge Ram Cars & Trucks

3 Answers

My 2004 Chevy Impala is running about 170 degrees. There is a strong gas smell even when the engine has been driven awhile and should be hot. Somebody said it may be either the temp sensor or the...

What you were told is that if the thermostat is not opening
soon enough or opening too far,it will effect what is called
closed loop. That is when the engine is warm and the O2 Sensors
take over fuel control, verse the computer on start up in open loop.

The Coolant Temp Sensor is the part doing the closed loop thing

So both have to be good

The stat should be changed every 5 years anyway
The temp Sensor can be tested

Also the o2 sensors can be viewed a number of ways

To work at home without knowledge of OBD Systems
you can't do much. Like trying to play doctor without
an 8 year degree to learn the craft

Feb 02, 2011 | 2004 Chevrolet Impala

2 Answers

I have a 2002 Ford Escort ZX2. The Auto store

This CODE is Indicating that ENGINE COOLANT TEMP is NOT Reaching TEMP HOT Enough to >CLOSE LOOP < This is when ECM takes over ALL ELECTRONIC CONTROLS, . It Basicly Points at A Coolant Temp Sensor that is Faulty or Thermostat that is RATED too LOW. Engine Must Reach 200 - 220 degrees

Aug 28, 2009 | 2002 Ford ZX2

2 Answers

P0125 obd code

P0125 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.

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

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 coolant sensor, or a low coolant level).

Apr 22, 2009 | 1998 Ford Explorer

1 Answer

Engine cuts out and Backfires

First thing i would check would be the mass air sensor. Sounds like its running rich after it goes into closed loop fuel. In open loop it has preset values and are based on the temp sensor. Then either run on the map sensor or mass air which everone it has.

Dec 28, 2008 | 1992 Chevrolet Lumina APV

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