2012 Mercedes-Benz E350 4MATIC Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2012 Mercedes-Benz E350 4MATIC

Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
Get a Repair Estimate For Your 2012 Mercedes-Benz E350 4MATIC
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more

2012 Mercedes-Benz E350 4MATIC Problems

Failed Gateway Module May Cause Lack of Audio/Cell Phone Functionality

Lack of audio or cell phone functionality may be related to the failure of the audio gateway module.

The Power Steering Fluid Reservoir Leaks

The power steering reservoir designed for the Mercedes Benz E350 4Matic 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.

Oil Seepage on Back of the Cylinder Heads

The Mercedes Benz E350 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.

See More Problems (3)

2012 Mercedes-Benz E350 4MATIC Questions

Is this 2012 Mercedes Benz a Lemon? (3 answers)

I am considering purchasing a 2012 mercedes e350 from carmax with 22000 miles. I pulled the carfax report and it shows the outside mirror replaced and repaired at 3418 miles. The a/c condensor was replaced at the 10,000 mile service. The valve cover gasket and timing chain/tensioner were replaced...

Need the "master" again - feel like I'm being taken by my Mercedes dealership (2 answers)

Service B - $495
Transmission Service - $350
Replacement Spark Plugs $715
Passenger Seat Motor & Connectors - $816
Blind Spot Assist Message INOP on Dash - $780
Serpentine Belt - $222
Command Power Up Check(radio,cd,nav, etc not working) - $365
Any help would be appreciated!

Whats wrong if my radio stop playing...the sound fades in a out...is it my speak (1 answer)

Fades in and out...is it the speakers how do i check what can be wro.g

See More Questions (4)