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Pursuant to inquiry, NGK/NTK corporate promptly responded that it offers ECT Sensor Part # EF0119 for 1998 - 2000 LS400..
It appears collared at junction between the sensor and connector shell..
Have not surveyed part or performed testing.
Online image for NGK/NTK ECT sensor part # EF0119. However the collar does not extend to the flats as does first generation (1990-1997) ECT