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Mercedes Home > Mercedes-Benz Technical Articles  > Mercedes-Benz C-Class W203 (2000-2007) Technical Articles
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Mercedes-Benz C-Class W203 (2000-2007) Technical Articles

C320 (1998-2004)

 E320 (1998-2004)

SLK320 (1998-2003)

  ML320 (1998-2003)

CLK320 (1998-2004)

 

Welcome to our Mercedes-Benz Technical Articles section. We've gathered a vast collection of useful articles to help you perform many repairs and upgrades on your Mercedes-Benz. Save money by doing your own work and perform the repairs using the information we've provided here. Can't find what you're looking for? Try our Search Engine at the top of the page, or hop over to one of our Technical Bulletin Boards - focusing on repairs for all Mercedes-Benz! If you'd like to support the site and submit your own Technical Article, contact us here!

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Jump to: Engine | Fuel Injection | Cooling System | Brakes | Suspension | Electrical | Body

 Basics & Essentials
Oil Change
Whether you follow Mercedes recommended interval or like to change your oil every 3,000 miles. Use this tech article to learn how to do the most common task to do on your C320.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Changing Your Oil and Filter
Whether you follow Mercedes recommended interval or like to change your oil every 3,000 miles. Use this tech article to learn how to do the most common task on your C320.
     Applies to: C230K (2003-2005)
Jacking Up Your Benz
Safely lift and support your Mercedes with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Kompressor Air Filter Replacement
New to working on your car? Not sure where the air filter is? Check out this simple article.
     Applies to: C230K (2003-2005)
Air Filter Replacement
New to working on your car? Not sure where the air filter is? Check out this simple article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Cabin Filter Replacement
Breathe clean air by changing your cabin air filters regularly.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Identifying and Removing Your Underbody Trays and Jack Points
Any work under the car is going to involve removing your under body trays. Figure out which goes where, and how with this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
 Engine
Replacing Your Air Pump
Trouble passing a SMOG test? Replace your air pump.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Belt Tensioner
Drive belts need the right tension to work correctly. Make sure your cars belt is operating properly with a new belt tensioner.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Breather Hoses
Replace your crankshaft breather hoses with the help of this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Change Over Valve
Check your change over valve if you’re a re having problems with your emission tests.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Valve Cover Breather Gaskets
Mercedes valve cover breather gaskets have a nasty habit of leaking oil all over the top of your engine. Fix the problem with the help of this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Spark Plugs and Coils
Changing your spark plugs and coils are an important part of maintenance on your car.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Fixing Your Air Pump Check Valves
Air pump check valves can cause your car to fail a SMOG test. Change them out with the help of this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Oil Level Sensor Replacement
Need a new oil level sender? This article will walk you through the process.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Camshaft Positioning Sensor
Rough running engine? Check your camshaft positioning sensor.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Crankshaft Positioning Sensor Replacement
A faulty crankshaft positioning sensor can cause your car to run rough or even not start. Replace it with help from this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Idler Pulley Replacement
Get rid of that squealing idler pulley by replacing it with a new one. This article will show you how.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Poly V-Belt
Worn drive belts. Here's some short instructions on this very basic of maintenance tasks.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Timing Chain Tensioner Replacement
Starting to hear chain slap or noises? Change out your tensioner before you suffer catastrophic engine damage.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Valve Cover Gasket Replacement
Got a small oil leak coming from the valve cover or spark plug tubes? Here's how to fix the leak.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
 Fuel Injection
Fuel Filter Replacement
Keep your car running strong with a new fuel filter.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Fuel Pump Replacement
Keep your motor running with a new fuel pump.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Fuel Injector Replacement
Fuel injectors wear out, leak and fail. Part of your regular maintenance should involve replacing them.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Oxygen Sensor Replacement
Rough running engine? Check your error codes for your O2 sensors
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
MAF Sensor Replacement
Changing the C320 MAF sensor is literally a snap with our handy replacement guide.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
 Brakes
Brake booster Diaphragm Positioning Sensor
Now replacing your brake booster diaphragm sensor is easy with this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing the Master Cylinder and Brake Fluid Reservoir
Master cylinders and reservoirs leak. This article shows you how to replace them to keep your brakes in tip top shape.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Brake Pressure Sensors
Need to replace your brake pressure sensors? Swap them out with the help of this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
ABS Control Module Replacement
Replace your ABS Control Module with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
ABS Sensor Replacement
ABS light on in the dash? Check your codes for a faulty ABS Wheel Speed Sensor.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Front Brake Caliper Replacement
Leaking or grabbing caliper? Change it out with the help from this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Front Brake Pad Replacement
Replace your front brake pads with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Rear Brake Pad Replacement
Replace your rear brake pads with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Front Brake Rotor Replacement
Brakes pulsing or grabbing when you stop? Replace your rotors with the help from this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
 Water Cooling System
Auxiliary Coolant Pump Replacement
Noises from your auxiliary coolant pump. Learn how to change it out here.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Coolant Expansion Tank Replacement
Coolant expansion tanks get old and leak. Keep your engine compartment clean and dry with a new overflow tank.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Coolant Level Sensor Replacement
Getting funky readings on your coolant level? Change out the level sensor with the help of this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Water Pump Replacement
Yikes! Leaking water pump? No problem replacing it with these step by step instructions.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Coolant Temperature Sensor Replacement
Check your water temperature sensor before replacing the thermostat.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Radiator Replacement
Radiators get holes in them. We can help you replace yours with this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Radiator Hose Replacement
Radiator hoses get old, brittle, and leak. Keep everything running cool by changing them out.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Thermostat Replacement
Car taking a long time to warm up or running too hot? Chances are you need a new thermostat.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
 Suspension
How to Replace Your Stabilizer Bar Links
Knocking noise while going over small bumps? Check your stabilizer bar links
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Replacing Front Control Arms
The control arm bushing are known to fail on the W203, replace your with the help from this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Replacing Front Sway Bar Bushings
Noises coming from the front end when cornering? It might be time to change out your sway bar bushings.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Replacing Rear Sway Bar Bushings
Tighten up your suspension and get rid of annoying squeaks by replacing your rear sway bar bushings.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Replacing Front Struts
Car bouncing down the road? Replace your struts with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
 Body
How to Access a Broken and Locked Trunk
Got completely locked out of your trunk? This article shows you how to get in with minimum damage.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
A/C Condenser and Air Baffle Replacement
Condenser got a hole in it? Change it out with help from this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Hood Shocks Replacement
Save a lot of money with this common and easy DIY tutorial
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Instrument Cluster Removal
Get your gauges working again by replacing your instrument cluster
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Removing Your Front Door Handles
Don't get locked out of your car by a failing door handle, replace it now with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Removing Your Front Door Lock
Fix your broken front door lock with the help of this easy step by step instruction
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Removing Your Front Door Panels
Fix up the look of your interior or fix something in the door with the help of this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Removing Your Lower Center Console
Replace your lower center console with the help of this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Removing Your Rear Door Panels
Fix up the look of your interior or fix something in the door with the help of this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Removing Your Upper Center Console
This article shows you how to remove the upper center console
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Replacing Your Cup Holder Cover
Freshen up your interior with a new clean and working cup holder cover.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Electronic Ignition Switch
Replace your electronic ignition switch with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Front Window Regulator
Fix broken window regulators with help from this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Lower Driver Side Dash
Let this article show you how to remove your lower dash step by step.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Middle Brake Light
Avoid an accident or fix it ticket by replacing your non working middle brake light with this easy step by step article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Replacing Your Power Window And Trunk Release Module
Get your windows and trunk working again by replacng this module
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Rear Window Regulator
Fix broken window regulators with help from this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Seat Switches
Get your seats working again with the help from this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Replacing Your Taillight Bulbs and Assembly
Be safe an make sure all your taillights are working with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003), C230K (2003-2005)
Steering Wheel Replacement
Upgrade your steering wheel with help from this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Removing Your Rear Door Handles
Replace worn out rear door handle using the step bt step instructions found here.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Removing Your Rear Door Lock
Replace worn out rear door lock using the step by step instructions found here.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Front and Rear Seat Replacement
Find out how to remove both the front and rear seats in this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Exterior Mirror Replacement
Replace your broken or damaged mirrors with the help from this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Front Seat Belt Replacement
Be safe and replace your belts at the first sign of damage.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Interior Pillar Panel Replacement
Lots of things are behind your interior trim panels. This article shows you how to remove them.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Exterior Molding Replacement
Spruce up the look of your car by replacing old and worn out molding.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Turn Signal Cruise Control Stalk Replacement
Replace faulty turn signal or cruise control stalks here.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
 Electrical
How to Replace Your Alternator
Alternators go bad, this article shows you how to put in a new one.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Light Switch Module
Replace your light control module with the help of this article
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Replacing Your Electric Fan
If your fan does not work the engine is going to get hot. Learn how to replace your fan with this article.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
Voltage Regulator Replacement
You don't always need to change the alternator. Save some money and learn how to test and replace your voltage regulator here.
     Applies to: C320 (1998-2004), E320 (1998-2004), ML320 (1998-2003), CLK320 (1998-2004), SLK320 (1998-2003)
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