Mercedes-Benz C300 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your Mercedes-Benz C300

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Mercedes-Benz C300
$
172
to $
433
Mercedes-Benz C300
$
74
to $
139
Mercedes-Benz C300
$
266
to $
840
Mercedes-Benz C300
$
94
to $
374
Mercedes-Benz C300
$
395
to $
1,764

Mercedes-Benz C300 Problems

Cracked Driveshaft Flex Discs May Cause Driveshaft Movement/Vibration

A vibration felt through the center floor of the vehicle can be caused by driveshaft flex discs, which crack and shred, causing excessive driveshaft movement. Not repairing these can cause damage to the driveshaft center support bearing, or, in the worst case scenario, damage to the transmission or differential.

Squeaking/Worn Brake Pads May Require Rotor Replacement Also

Due to the size and material used on the brakes of these vehicles, the brakes may start to squeak around the 50 percent wear point. The brake rotor surfaces become uneven, causing a lip to form at the outer edge of the rotor. Because of this, the rotors are usually replaced when the pads are worn (pad life varies depending on driving style and terrain).

Oil Seepage on Back of the Cylinder Heads

Mercedes Benz C300 models manufactured between 2008 and 2012 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.

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Mercedes-Benz C300 Recalls

Electronic Stability Control System Fails To Work

The electronic stability program control unit may have been damaged before being installed in the vehicle, which could prevent it from working properly while driving. Dealers will replace the electronic stability program control unit free of charge to resolve the concern.

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.

Glass Sunroof Detaches From Vehicle

The panoramic sunroof glass may not be properly bonded to the vehicle, and may detach and fall while driving. Dealers will inspect the bonding of the rear sunroof glass panel and replace it as necessary free of charge to resolve the concern.

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Mercedes-Benz C300 Reviews

bought a 2011 C300. When it came to extended warranty, I was told that it was a 2010 late model and therefore warranty expires in 2015. Needs new ABS/ Traction control module. It has a total of 25,007 miles. I was told not covered under warranty. Service managers response: Mercedes is not responsible for quality of parts. Had to pay over $2000 to fix this. Never heard of such module going bad...
Traded wife's BMW 328 for a 2010 C300 with 24000 miles. Have had it 8 months. It has been back to Mercedes 3 times with loss of all power steering fluid, twice in last two weeks. Dealership can't fix problem and charge $300 - $450 each time. Not enough dealerships in the Nashville area to service cars they sell. Impossible to schedule service times unless the vehicle is towed in. First and...
I bought my 2009 C300 Sport new and now at over 6 years and 66K Mi it's been a reliable and enjoyable car. I had a faulty xenon headlight, a few rattles, AC stink that requited a few cleanings, and a noisy belt tensioner fixed under warranty...pretty minor things and otherwise still on the original battery and brakes. It drives like new and I hope to keep it for at least another 6 years. The...

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