In my reading, chip based MAF sensors are very reliable.
Most likely cause seems to be failing lambda sensor.
Apparently there are some measurements in measuring block 30 via VCDS that may indicate this, but i haven’t found a good diagnostic guide.
Bosch suggests lambda sensors could be good for 160,000 km.
Old Bosch Australia oxygen sensor catalog 2013-4 has the most useful diagnostic and technical info i have found. Failing sensor reports oxygen closer to atmospheric causing computer to compensate with richer mixture. Tailpipe smell test indicated rich. That has corrected with new sensor.
Got a new Bosch lambda sensor and reported fuel consumption has dropped to lowest ever for daily drive. Only done half a tank.
2015 Polo Comfortline 6M + Driving Comfort Package
2011/11 Yeti 103 TDI 6M + Columbus media centre/satnav
(2008 MY09 Polo 9N3 TDI retired hurt hail damage)
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