Explanation of Citroen Peugeot Nox sensor fault codes. P220A2 - Nox sensor electrical supply. Voltage of component too low. P2200- NOx Sensor Circuit Bank 1. U029D00 - Communication with NOx sensor has a malfunction. U029D - Fault in Communication with the DeNOX system. Citroen C3 Picasso 2009-2017 (A58) Citroen C3 Pluriel 2002-2006 VAN. Citroen C3 Pluriel 2005-2009 CAN. Citroen C4 2004-2010 (B5) Citroen C4 2010-2016 (B7) Citroen C4 2016- (B618) Citroen C4 Cactus 2014- (E3) Citroen C4 Picasso 2006-2013 (B58) Citroen C4 Picasso 2013- (B78) Citroen C5 Aircross 2017- (C84) Citroen C5 I 2001-2004 VAN TwLBM.
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