I've had that before with my S80 ... Little bit of congealed oil or grub had managed to lodge on the sensor. Clears sooner or later ..or you can pull sensor and clean.
Iain
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S70 T5 1999 (now written off grrr)
S80 2.5T LPG 2004
XC90 D5 2005 (2006)
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