Damian Daize
Hi Stu,
Seen this before and it is indeed carbon build up.
Intake manifold off and walnut blast!
Hope this helps.
Message Thread 
Peugeot 308 1.2 HNY 3cy 2014 - Fault Codes P1034, P1033, P1032, P3060 - Fixed # - stuart skinner March 26, 2020, 12:05 am
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on March 27, 2020, 8:40 am, in reply to "