Hi Guys,

I am new to this forum, but not new to Land Rovers. I have a 1996 Discovery that I have owned since 2002, and it has been the best car I have ever owned...it has never left me stranded.

Recently though, my "check engine" light has been coming on. I have a friend who used to be a mechanic, and he used a code reader to diagnose the problem. He told me the code was a P0125 (I wrote it down), and it had something to do with my cooling system.

I had the radiator flushed, and replaced the thermostat as well as 2 temperature sensors. The problem went away for almost 2 months, then came back.

What else could it be?

 

According to my info, P0125 = Insufficient Coolant Temp For Closed Loop Fuel Control. I take this to mean that the coolant temp doesn't get high enough for the ECU to control the engine. Sort of like running with the choke on even when the engine should be warmed up. Are you burning a lot of gas, or is black smoke coming out of the exhaust ? Does the temperature guage show normal or low ? Looks like your thermostat might be stuck open or maybe just too cool. Any chance ?

 

You need to get your truck hooked to a scanner that can read the actual temp and sensor signals to make the correct decision as to what to repair/repair.

 

DiscoJag,

No black smoke or extra fuel usage, it is running very well as usual.

Disco Mike,
your suggestion makes a lot of sense. I guess I'll take it down to be analyzed. Unfortunately, there aren't many Land Rover specialists in El Paso...but I'll try to find the best I can.

Thanks for all you suggestions!!!

 

You don't need to go to Rover, a good hand held scanner will do the job, as long as it can read in real time.

 

What do you recommend for a thermostat, temperature-wise? I assumed a cooler-running thermostat would be better.

In the past, when I've had certain parts replaced, I tried to save money by getting them from the local auto parts store. I've had problems on a couple of occasions because the parts I bought were not actual Land Rover parts. Once I had the parts re-replaced with original Rover equipment, the problem would go away.

Do you think this could be my problem?

 

I would wait to get it analyzed before I made any choices about what to do. No need to replace things that are working.....and I would also want to make sure that the repairs I did make were going to solve the problem. Guessing around may work, but I'd rather just know what I needed to do instead of taking chances on guesswork.

 

I agree and as far as the t/stat goes, there is only one available for a D2, costs about $18.

 

harleygirl, when the vehicle has been running for 5-10 mins is the top radiator hose hot?

 

Do you know what temp sensors he replaced?