Vauxhall ASTRA Owner's Manual page 209

208 Driving and operation
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The self-cleaning function can not operate
automatically during certain driving
situations where the engine does not reach
its normal operating temperature. An
example of this would be driving only short
distances in cold weather. If the filter needs
cleaning and recent driving situations did
not allow the function to automatically
operate, then the control indicator
flash. If this occurs, then you may continue
to drive the vehicle normally. The vehicle
will not be damaged and does not require
service.
The self-cleaning function will
automatically operate while driving after
the engine has reached its normal
operating temperature. The control
indicator ! will continue to flash until the
self-cleaning operation is complete. This
may take up to 20 minutes of driving. The
time will be shorter at higher vehicle
speeds. If the vehicle is not moving for
more than a few minutes, then the self-
cleaning function will not operate.
Operation will continue when driving
resumes.
will
!
We recommend that you do not turn the
ignition off until the self-cleaning operation
is complete. If you must turn the ignition off
before the operation is complete, then the
operation will automatically resume when
driving the next time and after the engine
has reached its normal operating
temperature.