2006 Mercedes-Benz C350 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2006 Mercedes-Benz C350

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2006 Mercedes-Benz C350 Problems

Oil Seepage on Back of the Cylinder Heads

The Mercedes Benz C350 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 C350 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.

Engine Knocking on Cold Start

When starting the engine after sitting for several hours, a knocking sound may be heard for several seconds. This is a common issue with the 2005-2010 Mercedes Benz C350. There are three common problems that can cause this sound to occur:

-Oil pressure building too slowly, allowing for movement between the crankshaft and crankshaft bearings

-Stretch or wear of timing chain and components

-Balance shaft (counter rotating shaft) gear wear

The remediation for these problems can be crankshaft bearing replacement with correct size, replacement of timing components, or balance shaft replacement.

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2006 Mercedes-Benz C350 Questions

Why is the car ignition difficult to on engine after 1st ignition of the day? (1 answer)

Engine going off while warming the car in the morning or while on slow motion like trying to climb a bump. It happened about three times.

Please help! Where can i check, add transmission fluid on MB 2008 C350? (1 answer)

Where and how

transmission change (1 answer)

were and how do i change the transmission fluid on my car
please help

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2006 Mercedes-Benz C350 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.

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.

Air Bags in Sport Model Steering Wheels May Fail to Deploy Correctly

Certain passenger vehicles equipped with sport model steering wheels fail to comply with the requirements of the Federal Motor Vehicle Safety Standard # 208 "Occupant Crash Protection"In certain tests conducted by NHTSA, using an unbelted female crash test dummy, conditions were found that occupants may not be properly protected during a crash, resulting in injuries. Dealers will install a new airbag module free of charge. The Mercedes recall # is 2006020005

 

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