From a member of Britain's Volvo club:
"Before you change the sensor , just try unplugging the wiring from it and plugging it back in do this several times, you may find it will work fine after you do this because it resistance based measurement and if you have a poor connection on the plug it will put the sensor out of range.
I discovered this by accident when I was looking to replace my sensor needed to look at number of pins in the plug as there are two types for my car and when I plugged it back in it worked for a few days before going faulty again , so I just repeated the action several times and now its been working fine for months."
I would suggest a dab of di-electric grease while you are at it.
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Keeping it running is better than buying new
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