Repair » Mercedes-Benz

Mercedes-Benz Repair

Repair and maintenance information for Mercedes-Benz vehicles

Search Vehicle

 
Mercedes-Benz Repair Information
We'll help you out with everything you need to know about your Mercedes-Benz vehicle.

TOP 5 MERCEDES-BENZ REPAIR PROBLEMS

Damaged Engine Wiring Harness

The wires in the engine harness of some Mercedes-Benz models tend to become brittle when exposed to heat, and this leads to cracks in their insulation. Lack of insulation could spell danger to your engine. Fortunately, there are two viable solutions to this problem. You can replace the damaged engine harness with a new one, which can cost you around 1,000 bucks. The cheaper way is to fix the engine wiring harness yourself. Here's how to do it: first, remove the cover near the spark plugs to access the three wires. Then carefully remove the exterior insulation of the engine harness. Wrap each wire with electrical tape, and then wrap all the wires to hold them together. Finally, put everything back in place and start up your engine. The repaired wiring harness must fire on all cylinders at this point.

Noisy Struts

This is one of the typical problems in the 1986-1995 Mercedes-Benz E Class cars. Banging, popping, and rattling sounds are caused by leaking or loose struts. Determine the condition of the struts by inspecting the connecting bolts and mounting bushings. Make sure they are tightened and in tiptop condition. Check the struts for leaks as well. If the culprit is a leaking strut, replace it with a new unit.

Transmission Failure

The fluid in the electronic transmissions used since 1996 usually collects graphite from the clutches; this turns the color of the fluid from deep cherry red to dark gray or black. Darkening of the fluid's color is a sign of internal oil leak, which can affect the transmission. The fluid may cause electronic defects as it darkens the sensor windows within the unit. To prevent that, it is recommended that you change the fluid every 60,000 to 90,000 miles.

Ignition Failure

Ignition troubles in Mercedes-Benz models occur because of failure to replace the spark plugs at the right intervals. Spark plugs must be changed every 75,000 to 90,000 miles to lessen the risk of damage to other ignition components, firing voltage increase, and loss of engine power. Learn how to replace the spark plugs on your vehicle.

Faulty Mass Airflow Sensor (MAF)

Once this sensor is clogged with dirt, oil, and air filter fibers, its accuracy will definitely suffer. Inaccurate airflow measurement leads to a lot of problems such as engine hesitation, rough idle, and hard starting. If your vehicle shows these symptoms, you can restore the normal function of the sensor simply by cleaning it. You can find the MAF on the intake at the back of the engine of your Mercedes-Benz. Remove the sensor from its place and put it on an even surface. Then spray the wires of the sensor generously with an electronic parts cleaner. Remember to use only an electronic cleaner designed for automotive purposes. After spraying, put the MAF back in its place and let it dry for a minimum of one hour. And once the sensor has dried, start your Mercedes and see if it works well. If it doesn't, you will need to replace the sensor itself. View step by step mass airflow sensor replacement guide.