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2004 MERCEDES-BENZ C240 CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT MERCEDES-BENZ REPAIR SHOPS DON'T WANT YOU TO KNOW
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- Component Locations
- Wiring Diagrams
- Technical Service Bulletins
- Specifications
- A/C & Heater Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Cabin Air Filter Locations & Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service

A/C & HEATER SERVICE PROCEDURES FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
Mercedes-Benz -> Electric Cooling Fans -> Precautions -> Air Bag System Disarming & Arming -> Radio Coded Anti-Theft System
Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS
Air Bag System Disarming & Arming
Refer to and for air bag system disarming and arming procedures.
Radio Coded Anti-Theft System
Anti-theft radios have a coded theft protection circuit. The CODE card must be obtained before disconnecting battery, removing radio fuse or removing the radio. The serial number from the radio must match the CODE card.
After service has been performed proceed as follows:
- Connect radio power and turn key to position No. 2.
- Turn radio to On position. Word "CODE" will appear on display.
- Enter first di...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
Mercedes-Benz -> Fuel Filter Replacement -> Except 2003-06 E320 & E500 Sedans Less 4 Matic & 2004-06 E Series w/Gasoline Engines -> Fuel System Pressure Relief -> Removal & Installation
Vehicle: 2004 MERCEDES-BENZ C240 4matic 2.6 V6 GAS
Fuel System Pressure Relief
Do not smoke or allow an open flame of any type when working on or near any fuel system related components. The highly flammable vapor mixtures may ignite, resulting in serious personal injury.
Prior to disconnecting fuel lines, the fuel system pressure must be relieved to prevent accidental fuel spray.
After the battery has been disconnected and reconnected, some abnormal driveability symptoms may occur. The vehicle may need to be driven while it relearns its adaptive strategy.
- Ensure t...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
DRIVESHAFT, Replace -> Front -> Rear
Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS
Front
- Raise and support vehicle.
- Remove righthand sensor, downstream of TWC.
- Match mark front propeller shaft relative to flange of front axle gear and to flange of transfer case.
- Detach front propeller shaft from flange of front axle gear.
- Detach front propeller shaft from flange of transfer case.
- Remove propeller shaft from front axle gear.
- Reverse procedure to install, noting the following:
- Torque flexible coupling to transfer case (M10) 108 in. lbs. (M12) 13 ft. lbs.
- Torque flexible coupling to front axle gear to (M10) 108 in. lbs. (M12) 13 ft. lbs.
Rear
- Raise and support vehicle.
- R...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
Starter, Replace
Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS
- Disconnect battery ground cable.
- Raise and support vehicle.
- Remove fasteners and sound insulator panels.
- Disconnect both front HO2S electrical connectors and rear HO2S electrical connectors, then press them out of their brackets.
- Disconnect catalytic converters from exhaust manifold.
- Support exhaust system.
- Remove bolts and exhaust system bracket from transmission.
- Remove bolts and front exhaust system bracket from catalytic converters.
- Remove bolts and exhaust system bracket from underbody.
- Remove exhaust syste...
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CABIN AIR FILTER LOCATIONS & REPLACEMENT PROCEDURES FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
Cabin Air Filter Service -> Mercedes-Benz -> 2002-07 C & 2002-09 CLK Class
Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS
On 2002-05 models, under normal operating conditions the cabin air filter should be replaced every 15,000 miles. In dusty areas change the cabin air filter more often.
On 2006-08 models except AMG, under normal operating conditions the cabin air filter should be replaced every 24 months or 26,000 miles. In dusty areas change the cabin air filter more often.
On 2009 models except AMG, under normal operating conditions the cabin air filter should be replaced every 24 months or 20,000 miles. In dusty areas change the cabin air filter more often.
On 2006-09 AMG mo...
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MAINTENANCE LAMP RESET PROCEDURES FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
Mercedes-Benz -> Air Bag Off Lamp ->
Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS
The Air Bag Off should illuminate for 6 seconds when the ignition switch is placed in the On position. The lamp will illuminate when the specified child safety seat has been properly installed on the passenger front seat, indicating that the front passenger ...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS
Lower
- Drain coolant into a suitable container.
- Reposition clamp at radiator and remove hose.
- Reposition clamp at water pump and remove hose.
- Remove hose from vehicle.
- Reverse procedure to i...
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SERPENTINE BELT SERVICE PROCEDURES FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS
- Open engine hood.
- Remove front engine cover.
- Remove hose from silencer.
- Remove two bolts securing charge air hose to silencer.
- Rotate or lift belt tensioner arm counterclockwise using a suita...
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COMPONENT LOCATION DIAGRAMS FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
Component location diagrams for most 2004 MERCEDES-BENZ C240 cars and light trucks sold in the U.S. from 1990+.
![]() Components on diagram: |
![]() Components on diagram: |
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WIRING DIAGRAMS FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
OEM drawn wiring diagrams for most 2004 MERCEDES-BENZ C240 cars and light trucks sold in the U.S.
![]() Components on diagram: |
![]() Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
OEM TSB listings for most 2004 MERCEDES-BENZ C240 cars and light trucks sold in the U.S. from 1985+.
Document: Re-code the Software Calibration Number (SCN) Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS Auto Systems: |
Document: Maintenance Systems Overview Vehicle: 2004 MERCEDES-BENZ C240 2.6 V6 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 2004 MERCEDES-BENZ C240 AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 2004 MERCEDES-BENZ C240 cars and light trucks sold in the U.S. and Canada from 1970+.
- Brake caliper mounting bolt torque
- Brake drum runout, machining, & discard specs
- Minimum brake lining thickness.
- Brake rotor runout, parallelism, machining, discard, & finish specs
A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 2004 MERCEDES-BENZ C240 cars and light trucks sold in the U.S. and Canada from 1980+.
- Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap
COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.
PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules
QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 2004 MERCEDES-BENZ C240 cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.
- Automatic transmission/transaxles capacities, lubricant recommendations
- Differential/final drive capacities, lube recommendations, grades, & viscosities
- Final drive fill & drain plug torques
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
- Severe service maintenance & interval recommendations
- Tire sizes, wheel nut/bolt torque, pressures & rim sizes
- Transfer case capacities, lube recommendations, grades, & viscosities
TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 2004 MERCEDES-BENZ C240 cars and light trucks sold in the U.S. and Canada from 1980+
- Airflow sensor electrical specifications
- Tensioning specifications for systems with automatic tensioners
- Barometric pressure sensor specs
- Battery group number and cranking performance
- Crankshaft & camshaft position sensor resistance
- Engine compression pressures
- Coolant temperature sensor specs
- Computer advance.
- Diesel fuel temperature sensor resistance.
- Distributor advance specifications
- Ignition pickup coil resistance
- Exhaust gas recirculation temperature sensor resistance
- Engine fastener torque values
- Firing order diagrams
- Fuel system pressures
- Generator (alternator) specs
- Intake air temperature sensor specs
- Ignition coil specifications
- Fuel injector resistance
- Engine idle speeds
- Knock sensor resistance
- Manifold absolute pressure sensor specs
- Mixture control solenoid resistance
- Voltage regulator specs
- Spark plug applications & gaps
- Starter motor electrical specs.
- Tensioning specifications for systems without automatic tensioners
- Throttle body temperature sensor resistance
- Ignition timing in degrees at rpm
- Transmission oil temperature sensor resistance
- Throttle position sensor specs
- Vacuum sensor valve specs
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