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Mercedes-Benz C240 4MATIC Problems

Find the most common issues based on Mercedes-Benz C240 4MATIC owner complaints.
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Most Common Mercedes-Benz C240 4MATIC Problems

A repetitive clicking noise from behind the center area of the dash panel is usually caused by a broken stepper motor actuating arm. The actuating arm controls the direction of air flow in the clim...
The electrical connector at the automatic transmission may leak fluid into the wiring harness. If not repaired, the oil will migrate through the wiring harness and damage the transmission control...
Inside grab handles, the upholstery on the center console cover, and door trim panels can delaminate. Most commonly replacement of the affected part is necessary.
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2 Known Mercedes-Benz C240 4MATIC Brakes Problems

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...
It is not uncommon to encounter premature failure of the anti-lock brake system (ABS) modulator assembly due to dirty brake fluid. Our technicians recommend flushing the brake fluid every two years...

3 Known Mercedes-Benz C240 4MATIC Drive Train Problems

The electrical connector at the automatic transmission may leak fluid into the wiring harness. If not repaired, the oil will migrate through the wiring harness and damage the transmission control...
High mileage or older vehicles commonly develop leaks from the differential seals and/or cover. Our technicians recommend a complete reseal of the differential unit whenever these leaks are repaired.
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 ...

4 Known Mercedes-Benz C240 4MATIC Electrical & Lights Problems

The SRS (airbag) light can come on if liquids are spilled into the seat belt buckles, or if the liquid pools underneath the seat and gets into the electrical connector for the seat belt pretensio...
The ESP and BAS warning lights may illuminate due to a failed brake light switch. Replacement of the failed switch should correct this concern.
A dead battery can be caused by a faulty seat control module that does not properly shut down. Spilling liquids on the front seats can cause these modules to fail.

4 Known Mercedes-Benz C240 4MATIC Engine Problems

The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool of...
An engine oil leak may develop from the oil level sensor. Replacement of the leaking sensor will commonly correct this concern.
An engine Oil leak may develop from the PCV vent housing on the valve cover and/or the inspection plate on the front of the engine.

3 Known Mercedes-Benz C240 4MATIC Exhaust & Emissions Problems

Catalytic converter failure is common and may cause a Check Engine Light to illuminate.
Bad spark plug wires can cause misfires; the Check Engine Light may illuminate.
The mass air flow (MAF) sensor tends to fail. The engine air filter should be replaced when the mass air flow sensor is replaced; a dirty filter can allow debris to damage the new sensor.

3 Known Mercedes-Benz C240 4MATIC Heating & Air Conditioning Problems

A repetitive clicking noise from behind the center area of the dash panel is usually caused by a broken stepper motor actuating arm. The actuating arm controls the direction of air flow in the clim...
The heating, ventilation and AC (HVAC) heater box is susceptible to mildew buildup. This can result in a musty odor from the HVAC system, most noticeable when the system is first turned on.
The heater case for the center vents can crack near the stop sensors. If the stops break, the control motor will not know when to stop and will run continuously.

0 Known Mercedes-Benz C240 4MATIC Maintenance Problems

1 Known Mercedes-Benz C240 4MATIC Miscellaneous Problem

Inside grab handles, the upholstery on the center console cover, and door trim panels can delaminate. Most commonly replacement of the affected part is necessary.

3 Known Mercedes-Benz C240 4MATIC Suspension & Steering Problems

The sway bar end link joints may wear and cause a knocking noise over bumps. Loose or warn links should be replaced to correct this type of noise.
Irregular and premature tire wear can be caused by the front thrust link bushings cracking and causing excessive movement in the suspension. The thrust link bushings are fluid-filled (to help reduc...
The hold down nut for the upper front strut area can become loose, causing a knocking noise. This can be repaired without removing the strut assembly.

25
Known Mercedes-Benz C240 4MATIC Problems & Complaints

Bad spark plug wires can cause misfires; the Check Engine Light may illuminate.
Catalytic converter failure is common and may cause a Check Engine Light to illuminate.
Inside grab handles, the upholstery on the center console cover, and door trim panels can delaminate. Most commonly replacement of the affected part is necessary.
The CD changer may suffer from an internal mechanical problem. Replacement of the faulty unit is generally required to correct this issue.
The sway bar end link joints may wear and cause a knocking noise over bumps. Loose or warn links should be replaced to correct this type of noise.
The hold down nut for the upper front strut area can become loose, causing a knocking noise. This can be repaired without removing the strut assembly.
The heating, ventilation and AC (HVAC) heater box is susceptible to mildew buildup. This can result in a musty odor from the HVAC system, most noticeable when the system is first turned on.
The heater case for the center vents can crack near the stop sensors. If the stops break, the control motor will not know when to stop and will run continuously.
A repetitive clicking noise from behind the center area of the dash panel is usually caused by a broken stepper motor actuating arm. The actuating arm controls the direction of air flow in the clim...
Irregular and premature tire wear can be caused by the front thrust link bushings cracking and causing excessive movement in the suspension. The thrust link bushings are fluid-filled (to help reduc...
The mass air flow (MAF) sensor tends to fail. The engine air filter should be replaced when the mass air flow sensor is replaced; a dirty filter can allow debris to damage the new sensor.
The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool of...
An engine oil leak may develop from the oil level sensor. Replacement of the leaking sensor will commonly correct this concern.
The rubber bond in the harmonic balancer can decay, which causes the balancer to move and work its way toward the timing cover. If the balancer comes into contact with the timing cover while the ...
An engine Oil leak may develop from the PCV vent housing on the valve cover and/or the inspection plate on the front of the engine.
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