Mercedes S 420 Workshop Manuals and Repair Manuals

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Mercedes S 420

The Mercedes-Benz S-Class is a series of full-size luxury sedans produced by the German automaker Mercedes-Benz, a division of German company Daimler AG. The classification was officially introduced in 1972 Mercedes S 420 was manufactured as a 4-door sedan from 1987 until 1989, from 1995 until 1998 and from 2006 until 2009. It was also built as a 2-door coupe between 1994 and 1995. Coupe version was only available with petrol engines, while sedan versions were built with diesel and petrol engines. Car is available with automatic transmission style. The S-Class has ranked as the world's best-selling luxury sedan. The S-Class was Wheels Magazine Car of the Year for 1981 and 1999.

Mercedes S 420 FAQ's

How do I change the cabin air filter in a Mercedes S 420?

To change the cabin air filter in a Mercedes S 420, locate the filter housing, which is usually located behind the glove compartment or under the dashboard. Remove the housing cover by releasing the clips or screws that secure it in place. Take out the old cabin air filter and replace it with a new one, making sure it is oriented correctly according to the arrows or instructions on the filter. Reinstall the housing cover, ensuring it is properly secured, and test the air conditioning or ventilation system to ensure proper airflow.

How do I change the oil in a Mercedes S 420?

To change the oil in a Mercedes S 420, you will need to locate the oil drain plug, which is usually located on the bottom of the engine. Once you have located the drain plug, use a wrench to loosen it and allow the old oil to drain out. After the oil has completely drained, replace the drain plug and refill the engine with the recommended amount of new oil, making sure to use the correct grade and viscosity specified in the manual.

How do I check the transmission fluid level in a Mercedes S 420?

To check the transmission fluid level in a Mercedes S 420, start the engine and allow it to idle for a few minutes to warm up the transmission. Locate the transmission dipstick, which is usually near the back of the engine bay. Remove the dipstick, wipe it clean, and reinsert it fully. Remove the dipstick again and check the fluid level indicated on the dipstick. If the level is below the recommended range, add the appropriate transmission fluid while the engine is still running, being cautious not to overfill.

How do I replace a fuel filter on a Mercedes S 420?

To replace a fuel filter on a Mercedes S 420, start by safely relieving the fuel system pressure by disconnecting the fuel pump relay or fuse and allowing the engine to run until it stalls. Locate the fuel filter, which is typically located along the fuel line under the vehicle or inside the engine bay. Carefully disconnect the fuel lines from the filter, taking note of their orientation. Remove the old filter and install the new one, ensuring the fuel flow direction arrow or markings align correctly. Reconnect the fuel lines, ensuring they are securely fastened, and restore the fuel system pressure by reconnecting the fuel pump relay or fuse.

How do I replace a headlight bulb on a Mercedes S 420?

To replace a headlight bulb on a Mercedes S 420, start by opening the hood and locating the back of the headlight assembly. Depending on the specific model year, you may need to remove a dust cover or protective cap to access the bulb. Disconnect the electrical connector from the bulb, then remove the old bulb by twisting it counterclockwise or releasing the retaining clip. Insert the new bulb, making sure it is properly seated, and reconnect the electrical connector. Replace any dust covers or protective caps that were removed, and test the headlight to ensure proper functioning.

How do I replace a serpentine belt on a Mercedes S 420?

To replace a serpentine belt on a Mercedes S 420, start by locating the belt tensioner, which is usually equipped with a square hole or a specialized tool attachment point. Using a suitable tool or a wrench that fits into the square hole, rotate the tensioner counterclockwise to relieve tension on the belt. Slide the belt off the pulleys, making note of the belt routing. Install the new belt following the same routing, ensuring it is properly seated on all pulleys. Rotate the tensioner counterclockwise again and slide the new belt onto the pulleys. Release the tensioner slowly, allowing it to adjust and maintain proper belt tension.

How do I replace the battery in a Mercedes S 420?

To replace the battery in a Mercedes S 420, start by turning off the ignition and ensuring all electrical components are off. Locate the battery, which is typically located in the trunk or under the hood. Disconnect the negative (-) battery terminal first, followed by the positive (+) terminal. Remove any securing brackets or clamps, and carefully lift out the old battery. Place the new battery in the same position, reconnecting the positive terminal first, followed by the negative terminal. Ensure all connections are secure and test the electrical systems to ensure proper functionality.

How do I replace the brake pads on a Mercedes S 420?

To replace the brake pads on a Mercedes S 420, start by safely lifting the vehicle and removing the wheel. Locate the brake caliper, which is typically held in place by bolts or pins. Remove the caliper and carefully slide out the old brake pads. Inspect the brake rotor for any signs of damage or wear, and if necessary, have it resurfaced or replaced. Install the new brake pads, reattach the caliper, and repeat the process for the other wheels.

How do I replace the spark plugs on a Mercedes S 420?

To replace the spark plugs on a Mercedes S 420, start by ensuring the engine is cool. Locate the spark plug wires or coil packs, which are usually connected to the top of the engine. Care

How do I reset the maintenance light on a Mercedes S 420?

To reset the maintenance light on a Mercedes S 420, start by turning the ignition to the ON position without starting the engine. Within four seconds, press the reset button on the instrument cluster twice quickly. The maintenance counter will display the remaining distance or time until the next service. Press and hold the reset button until the display changes to indicate that the maintenance light has been reset.

How do I reset the tire pressure monitoring system on a Mercedes S 420?

To reset the tire pressure monitoring system on a Mercedes S 420, start by ensuring all tires are properly inflated to the recommended pressure. Turn the ignition to the ON position without starting the engine. Use the steering wheel buttons to navigate to the vehicle settings menu, then select the tire pressure monitoring system option. Follow the prompts on the screen to reset the system, which may include driving the vehicle at a certain speed for a specific distance or using a designated reset button. Once the reset process is complete, the tire pressure monitoring system should be recalibrated and display accurate readings for each tire.

How often should I change the air filter in a Mercedes S 420?

It is recommended to change the air filter in a Mercedes S 420 every 15,000 to 30,000 miles or as indicated in the owner's manual. However, the frequency may vary depending on driving conditions and the environment in which the vehicle operates. Regularly inspect the air filter for dirt, debris, or signs of damage, and replace it if it appears clogged or excessively dirty. A clean air filter ensures optimal engine performance and fuel efficiency.

What is the coolant capacity of a Mercedes S 420?

The coolant capacity of a Mercedes S 420 can vary depending on the specific model and engine type. Generally, the coolant capacity ranges from 11 to 13 liters. To determine the exact coolant capacity for your Mercedes S 420, refer to the specifications section in the owner's manual or consult a reputable Mercedes dealership or repair shop.

What is the recommended engine oil for a Mercedes S 420?

The recommended engine oil for a Mercedes S 420 depends on the specific model year and engine type. However, as a general guideline, Mercedes-Benz typically recommends using synthetic motor oil with a viscosity grade of 0W-40, 5W-40, or 5W-30. It is crucial to consult the owner's manual or the oil specifications label under the hood for the accurate and specific engine oil recommendations for your particular Mercedes S 420.

What is the recommended tire pressure for a Mercedes S 420?

The recommended tire pressure for a Mercedes S 420 can vary depending on the specific model and tire size. However, as a general guideline, the recommended tire pressure for most Mercedes S 420 models is typically around 32-35 PSI for the front tires and 35-38 PSI for the rear tires. It is important to check the owner's manual or the sticker on the inside of the driver's side door jamb for the accurate and specific tire pressure recommendations for your particular Mercedes S 420.

Mercedes S 420 Manuals Index

Mercedes S 420 Workshop Manual

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