CITROËN c4 picasso 2006 Owner's Manual page 92

D I E S E L P A R T I C U L A T E F I L T E R S Y S T E M
by the retaining of the unburnt pollutant particles. Black exhaust fumes are thus no longer emitted.
II
If there is risk of clogging, a message appears on the multifunction display, accompanied by a sound signal and
lighting of the SERVICE warning lamp.
If this alert persists, consult a CITROËN dealer.
Observation : After prolonged idling or driving at very low speeds, you may occasionally notice water vapour be-
ing emitted from the exhaust when accelerating. This is of no consequence to the running of the vehicle or to the
environment.
Diesel fuel additive level
If the additive level becomes too low, a message appears on the multifunction display, accompanied by a sound
signal and lighting of the SERVICE warning lamp. It is necessary to have the additive level topped up. Urgently signal and lighting of the SER lighting of
consult a CITROËN dealer.