Mercedes-Benz C350 Repair and Maintenance

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

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Mercedes-Benz C350
$
162
to $
394
Mercedes-Benz C350
$
156
to $
346
Mercedes-Benz C350
$
430
to $
1,293
Mercedes-Benz C350
$
202
to $
516
Mercedes-Benz C350
$
477
to $
1,059

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.

The Power Steering Fluid Reservoir Leaks

The power steering reservoir designed for the Mercedes Benz C350 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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Mercedes-Benz C350 Questions

My 2008 C350 shut off wont start. Is it the ignition or the battery? ? (2 answers)

the car drove and park came back out nd it won't start,the lights came on with key in ignition but won't start.

why is gas gauge inaccurate, why is there not a recall on this known problem? (1 answer)

i'm not the only one whose c350 has run out of gas due to the gas gauge being wrong! why is this? how much to fix it? why is it not a recall? it is dangerous to suddenly run out of gas when your car tells you you have 100 miles worth of fuel left, and the gauge is above 1/4 tank. anyone?

engine will not turn over. new battery. (1 answer)

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Mercedes-Benz C350 Recalls

Passenger Frontal Air Bag Inflator Ruptures On Deployment

The passenger frontal air bag inflator may rupture on deployment, causing metal fragments to come through the air bag and injure occupants. Dealers will replace the passenger frontal air bag module free of charge to resolve the concern.

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.

Air Bags Unexpectedly Deploy Or Do Not Function When Needed

The air bag control unit may corrode and cause it to malfunction, resulting in air bags that deploy when not intended, or do not deploy at all in an accident. Dealers will inspect and replace the air bag control unit as needed free of charge to resolve the concern.

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Mercedes-Benz C350 Reviews

I purchased a 2014 CPO C350 with 2,000 miles. during the first 700 miles the car seemed OK and I decided to keep it. When I started to travel back and fourth to work on a regular basis I found that the rear suspension very harsh, even the smallest bumps are amplified and the read seems to bounce excessively. I have taken my C350 back to MB service. The changes the tires, and were very accommoda...
dont fast on wet corners?????
I AGREE, Biggest trade off is with the tires. I finally got into some Michelin's that are GREAT! they were a tad bit more pricey, and they can be rotated from side-to side.. that is the best part. i'm able to get more wear from these tires than the ones that are recommended by the manufacturer.

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