Date registered: Feb 2010
Vehicle: 2004 C230 Coupe
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2004 C230 Coupe Owner Doing Own Repair Work
Good day. Recently got the CEL and several DTCs all at once after changing spark plugs, air filter, oil, oil filter, on the car. Based on the DTCs, replaced both O2 sensors and cleaned the MAF (by removing only the air filter, not the entire housing). Reset my OBD II (cleared it) and the CEL is off and no DTCs detected. One thing about the 2004 C230 upstream sensor - the upstream (before) sensor is 5-wire so the universal 4-wire ones won't work. I ordered the 5-wire that is made for the 2005 model year because I couldn't find a 5-wire for a 2004 C230K. The connector for 2005 was different than the existing one (2004 model). Wire on the 2005 is also much shorter. I cut the wires and used the 2004 connector on the 2005 sensor. It works!! Just wanted to share this because it did take me some research to figure this out.