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Mates just got an insignia 1.8 2011, had rocker gasket replaced by seller and now bringing up code p0171-00, no vac leaks, lambda swapped for a known good sensor, no change. Do these suffer with the pcv valve in rocker like others do? Cheers chaps!
 

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Check your fuel evap valve, these should default shut closed when unplugged so no vaccum should be felt.
If some form of vacuum is felt the diapghram inside has collopase causing it to constantly suck air.
 
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