Mercedes-Benz R350 Repair and Maintenance

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

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Mercedes-Benz R350
$
808
to $
1,049
Mercedes-Benz R350
$
272
to $
850
Mercedes-Benz R350
$
548
to $
1,443
Mercedes-Benz R350
$
199
to $
461
Mercedes-Benz R350
$
193
to $
364

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.

Check Engine Light and Engine Noise

The engine in the R350 is known by Mercedes Benz to have issues due to a poorly manufactured gear on the balance shaft (also known as the counter-rotating assembly). Since the balance shaft gear is driven by the timing chain, which keeps the engine rotating synchronously, when it fails, the timing of the engine will change causing:

-Illumination of the Check Engine Light

-Rough Running Conditions

-Stalling

-Loud Rattle or Slapping Noise

-OBD Trouble Code P1200 and P1208

Correction for this issue is replacement of the balance shaft, or balance shaft gear. Replacement of the timing chain and tensioner should be done as well. The Mercedes Benz dealer may cover some or all of the repair cost on select vehicles as a result of a class action settlement.

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Mercedes-Benz R350 Questions

I used a quart of oil in about 3 weeks, now it shows lite smoking under the hood (1 answer)

when I filled it the last time, I noticed it was showing smoke from under the hood as I get on the interstate,

A loud reving/fan sound came on and off an hour after being driven (1 answer)

It would come on suddenly like a siren, then taper down, up and down a few times. This was about an hour after I had driven it, keys out, and all locked up!?

is there a counter ring for ABS on a left front axle cv joint ? (1 answer)

I replace the left front wheel bearing and i don"t remember seeing a counter on the outer CV joint for ABS and my ABS light is on i reseted and comes back on saids problem whith wheel bearing,

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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.

Mercedes–Benz Recalls 2008 Vehicles for Defect in Power Steering Oil Pressure Driving Pin

Mercedes–Benz is recalling certain 2008 GL-Class, M-Class, and R-Class vehicles for a possible defect in the driving pin used to control power steering oil pressure. If the pin breaks during normal vehicle turning, the steering assist will no longer operate, causing difficulty operating the steering wheel. Dealers will replace the steering gear in affected vehicles.

Incorrect Software Calibration May Cause Fuel Pump to Remain Powered in a Collision

There is a faulty software calibration that affects several areas including shutting off the fuel supply in a collision. This could cause a fire hazard during an accident. Dealers will reprogram this software. The Mercedes-Benz recall number is 2008 070001. This recall began during August, 2008.

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Mercedes-Benz R350 Reviews

AVOID! Mercedes vehicles are nice when they work, but they spend most of their time getting piggie-back rides from tow-trucks. Just under 120K miles and total engine failure. Advised to replace cam magnets, replaced plugs also, codes went away - then suddenly blown engine! Balance shaft jumped timing, total engine loss. Before this, converted troublesome air suspension to conventional springs. ...
Bought a 2006 R350 with 22,000 miles in 2010, with a little hesitation because "it was traded in by an older couple on a new MB". The car was still under warranty for a couple months. The car now has 160,000 miles on (140,000 in 5 years).We have had issues on and off with the car, but try to do as much work on the car as I can. I have replaced the cam sensors, rear air sprongs,brakes and rotors...
I purchased this car about 1 month ago at a very good price. I read consumer postings regarding the relative issues and decided for the price it was worth the headache. Due to the left rear airbag leaking, I have replaced the rear air ride system with standard springs and shocks from Strutmasters. It was the best investment I made. Rides and drives well. Really everything else is regular mainte...

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