One problem related to gas recirculation valve (egr valve) has been reported for the 2004 Mercedes Benz C230. The most recently reported issues are listed below.
Fuel system is leaking getting check engine lights can't pass smog and egr hoses that run down by the super charger are leaking cause the rubber they used knowing this would happen all have to do with the check engine light on.
| Engine Oil Leaking problems | |
| Engine Exhaust System problems | |
| Gas Recirculation Valve (egr Valve) problems | |
| Engine And Engine Cooling problems | |
| Engine Belts And Pulleys problems | |
| Timing Tensioner problems | |
| Engine Cooling System problems | |
| Radiator problems |