NOx sensors monitor the level of nitrogen oxide emitted by a diesel vehicle to ensure compliance with emissions regulations. Most engines feature two NOx sensors: an upstream and downstream sensor. Common causes of failure include soot buildup on the sensor, ECU water intrusion and/or damage to the cable, which will cause the check engine light to illuminate. Replace your failing or faulty part with this direct replacement. Part also fits* E CLASS 2009 – 2013 NOX SENSOR (REAR), DIESEL, 3.0, TURBO, W212, 08/09-06/13 M CLASS 2005 – 2011 NOX SENSOR (REAR), DIESEL, 3.0, TURBO, W164, 09/05-12/11 M CLASS 2012 – 2016 NOX SENSOR (REAR), DIESEL, 3.0, TURBO, W166, 03/12-01/16 S CLASS 2008 – 2013 NOX SENSOR (REAR), DIESEL, 3.0, TURBO, W221, 02/08-12/13 CLS CLASS 2011 – 2013 NOX SENSOR (REAR), DIESEL, 3.0, TURBO, C218, 06/11-12/13 R CLASS 2006 – 2013 NOX SENSOR (REAR), DIESEL, 3.0, TURBO, W251, 04/06-12/13 *This is a guide only. If you are unsure if this part is suitable for your vehicle, please contact us and we can confirm prior to your purchase.
