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Anyone know roughly what the resistance across the above should be around ambient (20-25 deg C)? I measured about 1.6 - 1.7k Ohms??

Just checked a sensor from a spare airbox part number 0280130101 (Bosch) and it reads around 2.5kohm at about 18.deg c. Although it does reduce with temp increase.

OK, thanks, reckon mine must be OK then!