Hello.
While attempting to change the serpantine belt on my 03 S-type 4.2, the wrench slipped off, hit and broke the H2O sensor. The car now runs in limp or "restricted performance" mode and showing code PO117. I can't see how the sensor comes out as it doesn't appear threaded. As well, do I need a special tool? Once out, can I buy just the sensor? Looking online it is unclear as to if you can buy just the sensor or you must replace the entire thermostat housing. Am I opening a can of worms here as a DIYer?
Thanks.

 

Well if you slide off the rubber boot which covers the lower part of rhe sensor all will be revealed--the sensor is indeed a screw fit in the plastic housing and can be removed using a 19mm wrench or deep socket.
Sensors are on e-bay.com in the $20 range.

You should be able to effect the change,but I recommend you feel comfortable with your own skills and knowledge.Check the JTIS if not sure

 

Thanks a lot - I will get started on this today.

 

+1

Here's the JTIS section on ECT Sensor removal and refitting on your 4.2:

JTIS - S TYPE 4-2 Engine Coolant temperature Sensor.pdf

As you've had the engine running, give it time to cool right down before starting to remove the broken sensor..

Graham

 

Thanks everyone. Job completed and running fine now.