Bloody MAF sensor ! wtf is it with these sensors!. Had issues end last year and replaced with a brand spanking gen bosch unit - cost a fortune- now playing up again , Jesus !, fault code MAF . 
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G70 MAF testing
Then you have to suspect something else, like the wiring or the connector pins.
But first you should test your MAF:
MAF Testing worksheet:
G70 MAF Info:
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant -
Yep I've done the testing and wires are good, connectors are very clean and shiny, tested ohms and volts across pins as per the test and values are good., as per what they should be.
Cleared fault codes before I did tests and it ran smooth and wasn't lumpy when idling , and you could nt smell the petrol as you can when running rich . Re checked codes and only speed sensor as normal came up.
so not sure what to make of that... Will have to run it and see if it goes under boost ect..
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