The connectors from the sensors to the loom sometimes give trouble, if you follow the lead from the sensor you will find them, unplug and plug them in a few times with a squirt of WD40 should help.
Otherwise it could be the space between the sensor and reluctor ring changing as a result of movement in the wheel bearing.
Hi there
I checked and cleaned all the sensors and on the last wheel (off side front) found the reluctor ring was loose (fault suggested by Honest John). I don't know what's supposed to hold it in position - there's nothing obvious and I wasn't about to take the whole front hub assembly apart to find out as it just looks like poor design.
I put it in about the right position in line with the centre of the sensor and ran a bead of superglue round it - seems to hold fine (maybe that's how Peugeot do it) and no more fault.
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