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Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53153
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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C230 sedan: Check engine light on my 2004 C230. Code says

Customer Question

Check engine light on my 2004 C230. Code says " secondary air" . Can't find secondary air pump. What could it be?
Submitted: 1 year ago.
Category: Mercedes
Expert:  Marty replied 1 year ago.
Hi, can you post the fault codes and the vin number? I will be leaving work to drive home and won't be able to reply back to you until later tonight.
Customer: replied 1 year ago.
The code is P0410.
Expert:  Marty replied 1 year ago.
Can you post the last 8 digits of your vin number?
Customer: replied 1 year ago.
4f485241
Expert:  Marty replied 1 year ago.
Ok, there is no air pump on this model. The supercharger also serves as the air pump. I doubt that there is anything wrong with the supercharger. If you are getting a P0410 code I would inspect the vacuum hoses to the air pump switchover valve located at the front of the motor. Usually this problem is caused by a broken vacuum line. I'm going to send you some diagrams to help you locate the components.
Expert:  Marty replied 1 year ago.
Click on the attachment for the location of the switchover valve.
Expert:  Marty replied 1 year ago.
Click on the attachment for a description of the air injection system. Also check the hoses to the 126 recirculation valve.
Expert:  Marty replied 1 year ago.
Let me know if you have any questions. Please remember to rate my service so I can receive credit for my help.