it could also be post-MAF sensor yes. Could be the MAF itself also? Another thing I was reading was it could be a bad coil pack?
" When the engine mis-fires, it sends a slug of unburned fuel and air into the exhaust stream that flows down to the sensor and can throw a p2a00 code"
From Motordyne.
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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