Hi there, with engine cold, unplug sensor and it will unscrew with a spanner or a socket, ensure that the new sensor is at hand to refit, you do not need any sealant as the thread is tapered and will self seal, refit plug, you will only loose a small amount of coolant, so just run and re check level is correct to the full mark.
Mark (mhpautos)
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Friday, June 4th, 2010 AT 8:03 PM