2006 Mercedes-Benz C350 4MATIC Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2006 Mercedes-Benz C350 4MATIC
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2006 Mercedes-Benz C350 4MATIC ProblemsOil Seepage on Back of the Cylinder Heads
The 2006-2012 Mercedes Benz C350 4matic 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 engine in the C350 4Matic 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
-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.
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 4Matic. 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
The remediation for these problems can be crankshaft bearing replacement with correct size, replacement of timing components, or balance shaft replacement.
2006 Mercedes-Benz C350 4MATIC QuestionsMy check engine light stays on,where should I take it to get repair (1 answer)
I took it to AutoZone so they could check it,the reading say it the camshaft position sensors.the diagnostic codes reads 0016,0017.
How will I know which I need, the standard of HID?
After the car warms up you can smell (hot) from the drivers door back to the end of the car. All fluid levels are up, no flashing code or engine lights. Car still runs fine but you do have the hot smell. No visible leaks under the car.