Walker 921-2103 Ignition Coil

Ignition Coil for Mercedes-Benz and Sprinter

Walker ThunderSpark ignition coil Part Number 921-2103 is a direct-fit replacement for a wide range of Mercedes-Benz applications and select Dodge Sprinter vans. It is listed for models such as the Mercedes-Benz C300, E350, ML350, S550, and GL450, with fitment spanning 2005-2015 depending on the vehicle.

The ThunderSpark line identifies this coil as part of Walker’s ignition offering for late-model European applications. Use 921-2103 when replacing a failed ignition coil on a Mercedes-Benz or Sprinter equipped with the listed engine and configuration.

Key Features

• Walker ThunderSpark ignition coil
• Part Number: 921-2103
• Fits a broad range of Mercedes-Benz V6 and V8 applications
• Also listed for 2007-2008 Dodge Sprinter 2500 and 3500
• Application-specific fitment for vehicles with single coil or ThunderSpark notes

Fitment Details

• Fits 2013-2015 Mercedes-Benz G550, N/A, Incl.Boot; Single Coil
• Fits 2013 Mercedes-Benz S400, N/A, Single Coil
• Fits 2010-2012 Mercedes-Benz C250, N/A, Single Coil
• Fits 2008-2012 Mercedes-Benz C300, N/A, ThunderSpark
• Fits 2009-2012 Mercedes-Benz G550, N/A, ThunderSpark
• Fits 2007-2012 Mercedes-Benz GL450, N/A, ThunderSpark
• Fits 2008-2012 Mercedes-Benz GL550, N/A, ThunderSpark
• Fits 2010-2012 Mercedes-Benz GLK350, N/A, ThunderSpark
• Fits 2010-2012 Mercedes-Benz S400, N/A, ThunderSpark
• Fits 2011-2012 Mercedes-Benz SL550, N/A, ThunderSpark
• Fits 2007-2009 Mercedes-Benz SL550, N/A, ThunderSpark
• Fits 2006-2011 Mercedes-Benz C350, N/A, ThunderSpark
• Fits 2007-2011 Mercedes-Benz CLS550, N/A, ThunderSpark
• Fits 2006-2011 Mercedes-Benz E350, N/A, ThunderSpark
• Fits 2007-2011 Mercedes-Benz E550, N/A, ThunderSpark
• Fits 2006-2011 Mercedes-Benz ML350, N/A, ThunderSpark
• Fits 2010-2011 Mercedes-Benz ML450, N/A, ThunderSpark
• Fits 2008-2011 Mercedes-Benz ML550, N/A, ThunderSpark
• Fits 2006-2011 Mercedes-Benz R350, N/A, ThunderSpark
• Fits 2008-2011 Mercedes-Benz S450, N/A, Single Coil
• Fits 2007-2011 Mercedes-Benz S550, N/A, ThunderSpark
• Fits 2009-2011 Mercedes-Benz SLK300, N/A, ThunderSpark
• Fits 2005-2011 Mercedes-Benz SLK350, N/A, ThunderSpark
• Fits 2007-2010 Mercedes-Benz CL550, N/A, ThunderSpark
• Fits 2010 Mercedes-Benz SL550, N/A, Single Coil
• Fits 2008-2009 Mercedes-Benz C230, N/A, Single Coil
• Fits 2006-2009 Mercedes-Benz CLK350, N/A, ThunderSpark
• Fits 2007-2009 Mercedes-Benz CLK550, N/A, ThunderSpark
• Fits 2008-2009 Mercedes-Benz E300, N/A, Single Coil
• Fits 2007-2008 Dodge Sprinter 2500, N/A, ThunderSpark
• Fits 2007-2008 Dodge Sprinter 3500, N/A, ThunderSpark
• Fits 2008 Mercedes-Benz R550, N/A, Single Coil
• Fits 2006-2008 Mercedes-Benz SLK280, N/A, ThunderSpark
• Fits 2006-2007 Mercedes-Benz C230, N/A, ThunderSpark
• Fits 2006-2007 Mercedes-Benz C280, N/A, ThunderSpark
• Fits 2007 Mercedes-Benz E280, N/A, Single Coil

Common Replacement Reasons

• Engine misfire or rough idle
• Hard starting or intermittent no-start condition
• Loss of power under acceleration
• Check engine light related to ignition performance
• Weak spark output from a failing coil

Installation Notes

Verify the vehicle year, model, and fitment note before ordering. This ignition coil is listed for applications marked ThunderSpark or Single Coil, and the 2013-2015 Mercedes-Benz G550 listing includes a boot note. Confirm the original coil style and connector match the vehicle before installation.

Quality Assurance

Walker ThunderSpark Part Number 921-2103 is cataloged for the listed Mercedes-Benz and Dodge Sprinter applications. Use the exact fitment data above to confirm application coverage before replacement.