New Question on P0125 Code - Land Rover Forums - Land Rover Enthusiast Forum

Go Back   Land Rover Forums - Land Rover Enthusiast Forum > Vehicle Line Up > Discovery I

LinkBack Thread Tools Search this Thread
Old 04-17-2011, 05:22 PM
Junior Member
Join Date: Apr 2011
Location: Intermountain West
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default New Question on P0125 Code


I was hoping that this horse was beaten to death already, but apparently, it hasn't been.

I have a 1996 Disco V8. code P0125. Insufficient coolant temp, etc.

MY thermostat is only a year old; my sensor ohms at 260 cold and drops to 202 after running 10 minutes, so I assume that's good. My coolant level is fine. That said - my temp gauge only moves when it gets really hot (like when I lost my drive belt). My coolant level is fine.

So, code p0125, engine does seem as if its running hot, but individual components test out ok. What gives? Should I just replace the thermostat again for kicks and see if it goes away?

Anyone have a ohm reading spread on a working CTS?

Any tips/suggestions/slams for being an incompetent shade-tree mechanic are welcome.

Reply With Quote
Old 04-17-2011, 06:22 PM
jafir's Avatar
Super Moderator
Join Date: Nov 2009
Location: Arkansas
Posts: 5,460
Thanked 43 Times in 43 Posts

you could test the thermostat outside the vehicle.

RAVE lists the resistance of the coolant temp sensor:

Engine coolant temperature sensor (ECT Sensor)
This sensor consists of a temperature dependant
resistive metal strip. The resistance of the strip varies
considerably with coolant temperature, i.e. from 28K
ohms at - 30C to 90 ohms at 130C, and 300 Ohms
at 85C.
The ECT Sensor signal is vital to engine
running, as the correct fuelling is dependant upon
engine temperature i.e. richer mixture at low
temperatures. If the sensor is disconnected or failure
occurs a default value will be supplied to the system.
The initial default value selected will be based on the
value of the air intake temperature. This will increase
to a nominal warmed up value over an individual time,
programmed for each default value. The fault may not
be evident to the driver, there may be a hot restart
problem. The fault is indicated by illumination of the
malfunction indicator light (MIL) on North American
specification vehicles.

2006 LR3 HSE project
1987 D90 ex-mod, 2.5NA, LT77, 1.66 LT230, 7.50R16C Michelin XZL. D1 axles, Defender seats, exmoor acoustic matting, raptor gauge binnacle.

Previous Rovers:
2006 LR3 SE
2003 Discovery S
1999 D2 SE7
1996 D1 SE7
Reply With Quote
Old 04-17-2011, 11:43 PM
bmxermike's Avatar
Senior Member
Join Date: Apr 2010
Location: Colorado
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts

I had that same code after my expansion tank blew all the fluid out the seam. Didn't loose all my coolant but just a little, temp gauge creeped then went right back down. Replaced tank, filled collant, cleared the code and it never came back.

But you seem to have the code for a different reason.
1998 Discovery 1 LE --142,XXX Miles
2'' TF HD Lift -- 265/75
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Codes P0118 / P0125 BG Simons Discovery I 2 06-09-2015 11:42 AM
2001 Discovery code 300, Code 302 and code P1590 sayeedA Discovery II 0 11-15-2011 11:02 PM
P0125 & some more kaz Discovery II 9 05-13-2008 09:10 PM
Fault code P0125 Nitro96 Discovery II 8 12-22-2007 08:27 PM
Sensor replacement... P0125 apcollin Discovery II 2 12-05-2007 09:53 PM

1996, 1998, 39, 46, 98, code, coolant, discovery, land, p0125, po125, range, rover, switch, tempurture

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


All times are GMT -5. The time now is 12:16 AM.

LAND ROVER and its logo are the registered trademarks of Land Rover. Land Rover is not affiliated with