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MotoGP God
Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Yes, you need to check your PIR sensors as some are able to distinguish between a cat and a human, so will trigger for one and not the other.
If you don't have the right ones it should be a simple replacement job.