Clean your MAF with electronics cleaner first. The codes you pulled are the same code for the O2 sensors on each bank. The same code for both sides usually meens the MAF needs cleaning or replacing. 
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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