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I just replace the sensor on my 1990 240. The wires were mush. Cost was $40. Note that when I replaced mine that there was a small piece broken off the plastic mounting tab - so brush around the sensor with your hand after you remove the bolt to remove any small pieces. A couple of notes - after the new sensor is in place there is no a chance that you will drop something in the hole - the sensor fills it. Also after the sensor was in place, I tied a small string around the bolt before I put the bolt in. This was to retrieve the bolt in case I dropped it. Good luck.
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