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FIXITMAN, Master Technician
Category: Mercedes
Satisfied Customers: 17349
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The issue is with my 2011 mercedes benz c300 4matic. Check

Customer Question

Customer: My name is ***** ***** issue is with my 2011 mercedes benz c300 4matic. Check engine light is on saying it's the secondary air pump, i can't find the relay for it.
JA: Thanks. Can you give me any more details about your issue?
Customer: It says it's the Secondary Air Injection System Malfunction
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Submitted: 1 year ago.
Category: Mercedes
Expert:  FIXITMAN replied 1 year ago.

Hello, my name is Bobby. Thank you for the question. The relay for the pump is located in the front SAM unit which is locate under the hood on the driver side towards the firewall. Most of the time it is the relay that causes this. If you need more help with this please let me know.