What Rossco said ^^^^^^ and BTW if you have an all black no label
MAF from new that a mechanic fitted remove it from your car place it on the ground and hit it with a hammer .
Do yourself a favour replace it with a genuine correct coloured
MAF . No point diagnosing a factory
ecu with second rate crap sensors . The no label
MAF sensors are renowned for being shit they are cheap for a reason.