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2002 Mercedes-Benz ML500 Problems

RepairPal has identified the most common problems with the 2002 Mercedes-Benz ML500 based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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28
Known Problems

The engine may develop a stalling and/or no start condition due to a failed crankshaft position sensor.

A no start condition may develop due to an anti-theft system fault. If the drive authorization module fails to recognize the keys, the engine will not start. In many cases, a new module and keys will be needed to correct this problem.

The power steering return hose may leak at the radiator cooler fitting. If the clamp is not properly tightened, the hose can blow off, causing increased steering effort and a mess under the hood.

Electrical switches in the door latches can fail, causing the door locks to rapidly actuate up and down multiple times when the locks are activated by either the keyless remote or door lock switch. A new door latch will need to be installed.

Arms for the sunroof wind deflector break; if the broken pieces are not removed, they can jam the sunroof. 

An engine oil leak may develop from the oil level sensor. Replacement of the leaking sensor will commonly correct this concern.

The power window switch may fail and the windows will not raise. The main switch at the front center console is commonly at fault. A failed switch will require replacement.

Release cables for the rear seat (second row of seats) tend to stretch or break requiring replacement.

It is not uncommon for the power steering rack to develop a fluid leak requiring replacement of the rack assembly. Loss of power steering fluid may also cause an abnormal noise and damage to the power steering pump.

A problem with the ball joints can cause a creaking noise. There is an updated part to remedy this problem.

The mass air flow (MAF) sensor tends to fail. The engine air filter should be replaced when the mass air flow sensor is replaced; a dirty filter can allow debris to damage the new sensor.

AC system leaks and/or a faulty evaporator temperature sensor can cause poor AC cooling. The failed sensor can prevent the AC compressor from coming on. Leaks cause a low refrigerant level, which reduces the ability to cool.

Leaks may develop from the differential cover and/or seals on high mileage or older vehicles. Our technicians recommend a complete reseal of the differential unit if these leaks are addressed.

The ESP and BAS warning lights may illuminate due to a failed brake light switch. Replacement of the failed switch should correct this concern. A recall on certain 2002 models have been recalled for a related issue - for more information please click here»

As the spark plug wires age and are exposed to heat cycling, they start to develop micro cracks in the insulation around the resistors, which causes misfires and poor fuel economy.