Rough Idle & P0171 + P0174. Vacuum leak? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Rough Idle & P0171 + P0174. Vacuum leak?

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02-19-2018, 09:44 AM	#2
Lapister Registered User Join Date: Dec 2014 Location: Pasadena Posts: 261	Those 2 codes are referencing both banks 1,2 lean condition. Hissing does sound to be most likely vacuum leak after the maf. Did you check the hoses between the T and plenum? You are most likely introducing unmetered air thru a leak Last edited by Lapister; 02-19-2018 at 09:47 AM.

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