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The 2003 Mercedes ML500 frequently experiences various issues such as reduced performance, electrical malfunctions, and power steering problems. These issues stem from different faulty components in the vehicle. One common problem involves a decline in engine performance, often due to a damaged crankshaft position sensor. This sensor's failure disrupts the timing of air, fuel, and spark in the engine, leading to performance issues. Another common issue relates to electrical troubles, particularly alternator failures, which can prevent the vehicle from charging and potentially cause stalling. Additionally, the power steering system is prone to problems, as both the steering hose and steering rack are susceptible to leaks.
Issues with the engine, electrical system, transmission, brakes, seat belts, airbags, and suspension have been reported with the 2003 Mercedes ML500.