2009 Mercedes-Benz R350 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 Mercedes-Benz R350

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2009 Mercedes-Benz R350 Problems

Rough Shifting of Automatic Transmission

Vehicles equipped with a 7-speed automatic transmission may develop a rough shifting condition, most commonly going up from first to second gear and going down from third to second or second to first gear. Our technicians tell us this is due to an internal component failure. Mercedes has released updated parts; the transmission will need to be removed and disassembled to complete the necessary repairs.

Oil Seepage on Back of the Cylinder Heads

The Mercedes Benz R350 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.

The Power Steering Fluid Reservoir Leaks

The power steering reservoir designed for the Mercedes Benz R350 commonly leaks power steering fluid causing a screeching sound when turning the steering wheel, especially when the vehicle is stopped. The power steering light may illuminate on the dash for more severe leaks.

This is caused by cracking in the plastic reservoir, or a hardened, brittle seal between the power steering reservoir and power steering pump.

Remediation involves replacing the power steering fluid reservoir, power steering fluid, bleeding the system of air, and replacement of the seal between the reservoir and power steering pump.

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2009 Mercedes-Benz R350 Questions

One brake light on left botton and one on right top is out. The bulb and fitting have been tested and work. Could the problem be a fuse. Help!!! (2 answers)

The brakes tail light left is on the dash monitor but not for the right side.

Need to reset maintenance message lfor oil change (1 answer)

Why I'm hearing a noise under hood after I parked no keys in the ignition (2 answers)

I'm hearing this noise twice but today was the first time I herd it in awhile.. My rclass has check engine lite on for mass sensor...how can my car make a rumbling noise with no key in the ignition..

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2009 Mercedes-Benz R350 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.

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