2012 508 HDI Starting Problem

Yes all cleared. P0488 is the code that keeps reappearing. I can hear an air leak with the engine turned off. When I took the lead off the battery the leak stopped. Electric pneumatic solenoid ? My hearing is not the best. My young bloke thinks it firewall side of engine.
 
Solenoid valve in vacuum system. It operates the doseur valve, so trace the line back and use a mirror. See my post #8.

Check for leaks as well as electrical connections. The culprits were posted in that image previously.
 
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