2003 Mercedes-Benz C240 4MATIC Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2003 Mercedes-Benz C240 4MATIC

2003 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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2003 Mercedes-Benz C240 4MATIC Questions

how expensive is it to repair the evap line? (1 answer)

I need to add a quart of oil quite often. What could be the problem? (2 answers)

The oil light comes on quite frequently to add a quart of oil. Is that normal? Its maybe every 6 wks or so.

What are the causes and solutions for a P0563 error code? (2 answers)

Monday I was driving and my car started to not want to accelerate. I pulled over and it stated that the battery was bad. So when I go home (in the mountains) I changed it out with the new battery in my 2003 BMW 525I to see if this would correct the problem. The check engine and battery lights bot...

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2003 Mercedes-Benz C240 4MATIC Reviews

Love love love my C240 4-matic. In being the original owner for 13 years I have only dealt with 2 major services at MB and fixed incidentals and oil changes at 10k with original parts for less than the suggested $300 at the dealership. It is a matter of the dealerships having proficient techs who know what they are doing or are not expected to break stuff to get you to trade-in when your c...
I feel the build quality is very high. However, if you care more about reliability than handling, comfort and a smooth drive train. Look at a lexus.
WORST Mercedes-Benz ever made! This car has cost me thousands of dollars in repairs and my extended warranty has paid out more than I paid for the car to actually fix items! I have been to the dealership 15 times in 2.5 years in which 4 of those times were for the same problem that has yet to be corrected. I filed multiple complaints with the National Highway Traffic Safety Administration (NHTS...

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