P1421 Citroen Cold Start Control
Possible causes
– Lack of intake air volume (block air filter)
– Fuel injection system (Clogged fuel injector or bad fuel pump)
– Faulty Engine Control Module (ECM)
– Fuel injection system (Clogged fuel injector or bad fuel pump)
– Faulty Engine Control Module (ECM)
What about the obd code?
The P1421 Citroen code is detected when The Engine Control Module (ECM) does not control ignition timing and engine idle speed properly when engine is started with pre-warming up condition.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1421 Citroen Description
The Engine Control Module (ECM) controls ignition timing and engine idle speed when engine is started with pre-warming up condition. This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.
Citroen Vehicle:2013 Citroen,2012 Citroen,2011 Citroen,2010 Citroen,2009 Citroen,2008 Citroen,2007 Citroen,2006 Citroen,2005 Citroen,2004 Citroen,2003 Citroen,2002 Citroen,2001 Citroen,2000 Citroen,1999 Citroen,1998 Citroen,1997 Citroen,1996 Citroen,