Fault code p123900 charge air vacuum sensor

[Beema008]

Engine management light and intermittent limp mode on my A class diesel 2012
any advice as I need to sell the car to pay towards a ulez compliant and haven’t got £100’s to spend on my beloved baby Benz Diagnostic at garage came up with this fault code and they advised me to go to a Mercedes garage who could help! Any advice much appreciated.

 

[AMGeed]

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Mercedes Servicing, Tuning, Remapping Tonbridge | AMF Automotive

Welcome to AMF Automotive Mercedes Specialists. For Mercedes Servicing, Tuning & Remapping Tonbridge come to us. We are Mercedes & AMG specialists in Kent.

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You already have the diagnosis so get a Mercedes specialist to fix the problem.
Far cheaper than main dealer but OE parts used.