2004 Mercedes-Benz C240 4MATIC Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2004 Mercedes-Benz C240 4MATIC

2004 Mercedes-Benz C240 4MATIC Problems

Dead Battery Due to Failed Seat Control Module

A dead battery can be caused by a faulty seat control module that does not properly shut down.  Spilling liquids on the front seats can cause these modules to fail.

SRS Light Due to Spilled Liquid on Buckles or Underneath Seat

The SRS (airbag) light can come on if liquids are spilled into the seat belt buckles, or if the liquid pools underneath the seat and gets into the electrical connector for the seat belt pretensioner. Damaged components will require replacement to restore proper airbag operation.

Mildew in Heater Box

The heating, ventilation and AC (HVAC) heater box is susceptible to mildew buildup. This can result in a musty odor from the HVAC system, most noticeable when the system is first turned on.

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2004 Mercedes-Benz C240 4MATIC Questions

Turn signal switch will not cancel after completing a turn (1 answer)

I recently changed my daughter's combination switch and now it will not cancel automatically after completing a turn. I found a small brass ring on the floor before installing the new combination switch. I could not see where it could have came from. Need technical help. Thanks

the cost to replace a rear differential on a 05 c240 4matic (1 answer)

noise in the rear of the vehicle when turning or backing up and sometimes while driving

I've checked everywhere online and can't find a replacement cup holder. help (1 answer)

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