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This is exactly how to remove the glowplugs in your Mercedes C Class W204 (and most other Mercedes cars to be honest) The i980 kit we used to diagnose the fault is available here http://www.diagnostic-world.com/pages/Mercedes_Benz_iCarsoft_i980_Multi_System_Diagnostic_Tool_SRS_ABS_Engine_etc__189010-z=605301&p=99689.cfm