2009 Mercedes-Benz ML550 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 Mercedes-Benz ML550

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2009 Mercedes-Benz ML550 Problems

Supplemental restraint system (SRS)/ai bag light may illuminate

The supplemental restraint system (SRS)/airbag light may illuminate due to damaged wires in the steering column. Any damaged wires should to be repaired and protected as necessary from further damage.

Transmission May not Shift into Drive Due to Failed Selector Module

The transmission drive selector module may fail resulting in the loss of gear selection capability. This condition can leave the vehicle stranded, and will require replacement of the drive selector module.

Oil Seepage on Back of the Cylinder Heads

The Mercedes Benz ML550 may have engine oil seeping or leaking from the back of the cylinder heads. This is commonly misdiagnosed as leaking valve covers.

On the back of the cylinder heads there are three, in total, plastic expansion plugs that plug access ports to the camshafts. These plugs are well known for seeping oil, and leaking if left unattended. The oil will run down the back of the engine and eventually make it to the ground. 

Replacement of these three plastic plugs is extremely simple, and should be done as regular maintenance. The recommended interval for replacement is every 60,000 miles.

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2009 Mercedes-Benz ML550 Recalls

Driver's Frontal Air Bag Inflator Ruptures And Sprays Metal Fragments

The driver's frontal air bag inflator may deploy the air bag with excessive pressure, resulting in the inflator rupturing and causing metal debris to be sprayed onto vehicle occupants. Dealers will replace the driver's frontal air bag module free of charge to resolve the concern.

Possible Electrical Fire from Water Damaged Lift Gate Control Module

Due to a faulty seal around the tail light assembly, water may enter the rear compartment containing the spare tire. The water could damage the lift gate control module, causing it to fail. The failed module could overheat, increasing the risk of a fire. Dealers will update the tail light seals and relocate the lift gate control module. This recall is expected to begin during April of 2009. The Mercedes recall number is 2009030003.

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