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Good afternoon,

I have a 1999 CLK320 coupe and just the other day the Check Engine light came on. The following error codes were received: P0450 (Evap Emission System Pressure Sensor Malfunction) and P0400 (Exhaust Gas Recirculation Flow Malfunction).

On a different website ( it states the following: You will need an EGR valve and tube for the P0400 fault code and start with a purge valve for the P0450 fault.

Has anyone had the error codes listed above and, if so, where did you start/end in getting the issues fixed?

Thanks in advance for any responses given.

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