Their are different kind of services, the more you drive, the more and deeper service is required ! get your self a owners manual, all required service intervals should be listed. If this is your question ?
SOURCE: How can I test a Mercedes 2002 C240 Cooling fan on the bench?
Connect 2 wires to fan plug, w/ other end of wires touch to battery terminals (disconnect battery to make sure you don't accidentally touch the wires together while doing this, as you can damage the electrical system). When you touch to the batt. terminals, the fan should kick on. If it doesn't, the fan motor is shot, if it does turn on, it is a relay that is bad, not signaling the fan to turn on when it should (as engine temp goes up).
SOURCE: Replace Cabin Filter in my 2002 C240 Mercedes Benz
after changing air filter and spark plugs engine still shakes ???
SOURCE: How To Change Oxygen Sensors in 2002 Mercedes C240 Sedan?
I do not know the part numbers but you have 4 sensors. 2 pre and 2 post catalytic converter. The pre sensors are the most sensitive and are generally the ones to fail. the rear sensors usually have a heater circuit problem. If your just replacing them for routine service interval I would just do the fronts. They connect to the engine wire harness in the front of the transmission pan. You may need an o2 sensor socket to remove the fronts. They are just a 22mm. in size.
Testimonial: "Thank you for the reply...I appreciate your time! Will replace front O2 sensors and see if check engine light goes out...thanks again...Jamie."
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