P0171 & P0174 codes on E350 CGI

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x332race

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Does anyone have any model specific pointers as to what to look for on a 2010 E350 petrol throwing P0171 & P0174 codes? I am assuming an air leak is the most obvious fault?

I can see nothing obvious but it is difficult to look at the back of the engine.
 
Update:- dipstick was not the only problem. Following on I was still getting occasional P0171 /P0174 codes. After full diagnosis found that there was a hole in the pipe serving the purge valve which was only obvious when purge valve was open.
 
This is were a smoke machine comes in useful when trying to trace such leaks, such as secondary evaps faults.
Nowadays an essential professional shop addition to have at hand .
Tuercas Viejas
 

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