Chris Angus
Yep, had exactly the same fault last week, oil filler cap not on properly, so affecting the vac system, if this fault is detected it switches the fans on, must be some kind of protection.
Autologic confirmed this too.
Message Thread 
Peugeot 207 1.6 5FW 2007 - Cooling fan on constant, code P11aa - Fixed # - andyhyoung March 16, 2014, 12:05 pm
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on March 17, 2014, 4:39 pm, in reply to "