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getting CEL p1128 and p1140

  • 2000
  • Boxster
Mileage: 
78 000
Engine
Carmel, 
Indiana

I keep getting CEL P1128 P1140.  Changed all o2 sensors, h20 thermostat. cleaned MAF, Cleaned MAF sensor. No oil leak from AOS to air intake,AOS shows no oil leak. Removed oil cap and suction seemed normal. No lose of idle when doing this.  could it be the fuel ?

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