Mercedes-Benz W220 (S-Class 1998–2005): common faults, maintenance guides and repair tips.
The most common leak points are the top end or air bag of the air spring (strut), the valve block and the compressor's pressure relief valve. If only ...
Start with the fuse and relay, then the wiring and the compressor's electrical connector. The connector can oxidise and break. A cracked intake pipe c...
The cause can be the height sensor, a solenoid valve or the valve block (distribution valve). Sensors rust and seize, and valves oxidise or get dirty....
A worn air spring bellows is fixed by replacing the bellows or the whole strut. Air springs are typically among the first parts to fail on the W220. D...
The message is common and only says that the system has detected some fault. The cause can be, for example, a bad connector or contact, an air leak or...
In limp mode usually only 1st and 2nd gear and reverse work. Typical causes are a fault in the conductor plate inside the transmission or its speed se...
The lever is locked electrically, and a solenoid releases it only when the brake is pressed. If the solenoid gets no power, the lever stays in P. The ...
The cause varies. One cause is the operation of the transmission's torque converter lock-up when cold. Another is too little fluid, because cold fluid...
Connect a clamp ammeter to the battery cable and pull fuses one at a time. When the measured current drops, you have found the consuming circuit. The ...
Disconnecting the battery or a voltage drop can store harmless fault codes in several control units. That is why the warnings stay on even though noth...
Most likely the PSE pump (the vacuum pump that moves the locks) is not getting power or is faulty. First check its 20 A fuse no. 62 and the condition ...
The cause can be a blown fuse: the ignition switch and the central locking share a fuse, which can blow, for example, from a short circuit in the alar...
A common cause is the heater core control valves, known as the "balls" or "ram's eggs". When a valve sticks, hot coolant reaches one side of the heate...
The most common cause is a lack of refrigerant due to a leak; leak points include the condenser, the compressor and the connections. The compressor ca...
First check the 40 A fuse F35 in the right-hand fuse box under the bonnet. Then make sure the controller gets operating voltage and ground. If the mot...
The tail lights have no fuse of their own, because the electronics of the SAM control unit protect the circuit. The most common cause is oxidation in ...
The cause can be the sensor's wiring harness: the wire sheath can be broken and the wires touch each other. The harness should be checked under load, ...
The cause can be a faulty injector, for example a cracked injector body, or a leak in the turbo air hose, which leaves too little air for combustion. ...
The leak can be in the O-rings between the water pump and the oil wall or in the seal between the timing cover and the block. The coolant then flows i...
If the spark plugs are the correct ones and intact, the ignition coils and spark plug leads are replaced next. When a fault code points to a specific ...
The cause of the vibration can be the rear flex joint (rubber coupling) of the propshaft or its support bearing, whose rubber has torn. The vibration ...
It depends on the joint. The lower control arm ball joint is pressed into the hub with a press. In an Airmatic car the lower-end joint of the strut is...