i have a 2012 vauxhall Zafira 1.7cdti ecoflex motor which has low mpg, i have tested for obd2 codes but there are none,live tests show MAF sensor readings fluctuating from 7.9 to 15.11 g/S on tick over with engine at 77 degree c,850 rpm, MAP reading constant 110Kpa. is my MAF sensor suspect? the motor drives fine,
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