![2003 mercedes kompressor 2003 mercedes kompressor](https://i.ytimg.com/vi/8LnBIz-J9Xc/maxresdefault.jpg)
Does not stop them from leaking but you can't have everything. MB recongnizes this as a problem and offers harness extensions that are relatively cheap, like $25 that will prevent the leaking oil from getting into the main engine harness. Costs to fix involves a new harness, new O2 sensor and 2 cam magnets, not cheap but there's good news. O2 sensor codes - the cam magnet sensors leak oil through their connector, it weeps into the harness and trickles down to the O2 sensor and ruins it. Not all 2003's had this, you have to get under the car and check for a Valeo sticker. Catch it early and you can get by with just buying a new radiator. Valeo Radiator - cracks internally and leaks coolant into the auto tranny, cost to fix, new tranny. Good news is MB dealers should fix it free, the hose is only $11, but if they don't in your country, figure a few hours labor at a dealer to replace it. Running rough - MB had a service campaign on the vent hose under the intake. that's about $3,500 but I think you can send the head out for valve job and it may cost you only $1,200-1,500. Typical dealer fix is to replace the head and in the U.S. Misfire codes, typically cyl #3 (P0303 code) is likely the valves got dirty and are not sealing. Here's the known defect that can make your car run bad. The good news is that they don't make that motor anymore (at least for the U.S.
![2003 mercedes kompressor 2003 mercedes kompressor](https://i.ytimg.com/vi/M9D7TWfPD0I/maxresdefault.jpg)
2003 C230's had the most problems, or maybe it seems that way because it was the first year for that motor and people like me haven't reached that point yet on our 2004-2005 cars.