"Engine Rich" or "Rich Mixture" means there is an excess of fuel during the engine combustion. The ideal Air/Fuel (A/F) ratio is 14.7:1, which means 14.7 parts of air to one part of fuel. Leaking fuel injectors, bad spark plugs, faulty Mass Air Flow (MAF) and faulty A/F Sensors, are common problems when the engine is running too rich.
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See real-world Mercedes-Benz E-Class brake problems and repair histories as reported by other Mercedes-Benz E-Class owners. Also, see repair breakdown by problem area and cost.