407 "depollution" system

Hi,

This morning when I started the 407 136 HDI the engine monitoring 
indicator came on, and the message "depollution system fault" 
appeared.  However, using the car again this afternoon it had gone, 
and everything was normal.

The only odd thing is that tthe temperature last night was the lowest 
the car has ever experienced, -6.7C. By this afternoon things had 
warmed up somewhat.

Does anyone know if this system (presumably the particulate filter) is 
sensitive to low temperatures, or do I need to get the car looked at 
by a dealer?

Martin

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