2009 Mercedes-Benz C300 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 Mercedes-Benz C300

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2009 Mercedes-Benz C300
$
192
to $
433
2009 Mercedes-Benz C300
$
427
to $
840
2009 Mercedes-Benz C300
$
74
to $
139
2009 Mercedes-Benz C300
$
175
to $
480
2009 Mercedes-Benz C300
$
202
to $
374

2009 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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2009 Mercedes-Benz C300 Questions

I just had my oil changed and filter along with changing my brakes car started. (1 answer)

But next day car would not start. Any suggestions on what the problem is? I have checked all fuses and ok so that not it. Also checked battery ok just replaced it in March of this year. I'm lost

my car does not start and it just makes like a click sound, what can it be ? (1 answer)

A day before it didn't turn on I had to turn the key more than usual, and usually my car turns on right away when I put the key and turn it a little but today it just didn't turn on! What can it be?

I'm getting ready to purchase a 2009 c300 4matic....any advice pros, cons? (1 answer)

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2009 Mercedes-Benz C300 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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2009 Mercedes-Benz C300 Reviews

Rated
based on 5 customer reviews
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...
I bought my 2009 Mercedes C300 5 months ago. It only had 26,700 miles on it so I thought I was getting a practically new car...I was wrong! This car has so many problems...big and small...the first week that I had it I noticed oil leaking...had to get the bearings replaced in the motor. It shakes breifly at startup. The clear coat paint looks like it's coming off in a few places. The drivers ...
This is our first 2009 c300, we will have a mercedes from now on,, i think this is one of,, if not the best car in the market. We bought ours through Car-Max and it checks out.Thank you Mercedes

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