A "direct fit" sensor will have the four wire wiring harness with connector attached. A "universal fit" sensor will have just four wires that you need to splice to the existing wire with a splice kit. Make sure you get the correct one by comparing the #. SOme vendors have the wrong number sensor listed for the 850. This caused me a lot of grief (and $$) DOn't drop it during installation or get any of the antiseize paste on the tip as this will ruin it. Is a straight forward job unless the old sensor is seized in the pipe. If so, soak it with a lot of PB Blaster and it should come out. Good luck
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