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I got the code P0400 code on my BMW, what is the meaning of the code?

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I got the code P0400 code on my BMW, what is the meaning of the code?

Vehicle: BMW

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P0400 Exhaust Gas Recirculation Flow Malfunction

Possible Solutions 

- Clean EGR Valve 
- Repair EGR harness or connector 
- Replaced EGR volume control solenoid valve 
- Replaced EGR volume control valve

more info at https://www.autocodes.com/p0400.html

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