C-Class (W202) 1995-2000: C 200 CDI, C 220 CDI, C 270 CDI, C 180, C 200 K,C 230 K, C 220, C230, C 280

Code P0411

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Old 09-27-2017, 05:29 PM
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1995 C280
Code P0411

Hello, I have a 1995 Mercedes Benz C280 In-line6 and it has a code P0411, saying= Secondary Air injection Upstream Flow detected.
I recently changed the MAS, EGR and the switchover valve.
Please help

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