I got a 2001 Jaguar S-Type 4.0 and the engine light came on. The code is a P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control). Can someone tell me how i might be able to fix this problem? what can this be and what does it mean? I'm thinking about changing the engine coolant temperature sensor might fix this problem. Can anyone help please. thanks

 

I would probably try replacing the thermostat first.

 

Thank you. I will try that and post the result

 

so, i replaced the thermostat and the check engine light came back on with a P0125 code. Anyone knows how to fix this issue? thank you all.

 

From the 2001 X200 DTC summary

P0125
possible causes

Low coolant level
Contaminated coolant
Engine coolant thermostat failure
CHT Sensor to cylinder head poor contact – V6
ECT / CHT Sensor to PCM sensing circuit:
high resistance, open circuit or short circuit to
high voltage
Engine cooling fan stuck on high speed
Above normal air flow through engine
compartment due to accident damage and/or

missing panels

bob gauff

 

going to replace the engine coolant temperature sensor tomorrow. i will let you all know what happens

 

move to Texas......thatll fix a Too COLD temp.....

 

replaced the coolant temperature sensor and everything seems good except now my air bag engine light comes and stays on. i guess i bought a lemon :-)

 

No, you bought a Jaguar.

 

Just remember you have a 9 year old car. There will be issues as it ages. I got my '01 XKR when it was 6 years old and spent the first year sorting out the issues and now I have a very reliable car. Previously owned vehicles are usually on the market because the owner has started experiencing age related issues and is replacing it. Also note that the owner that is considering replacing it is not going to put a lot of money into it prior to replacing it. This is true for any used car, not just a Jaguar. When buying a used car, try to buy the best you can, but expect to have to sort out a few problems at first.