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Volvo uses the same MAF sensor for turbo and non-turbo on 4 cylinders. They don't make it so hard. It's more a case of using a MAF sensor that falls into the needed CFM range. LH 1, 2 and 2.1 use the same #, LH 2.2 4 cyl use the same #, LH 2.2 6 cyl uses another # (it is a larger in diameter), LH 2.4 models use another #. The Motronic 1.8 inline six uses yet another #.
All but the 2.4 and M1.8 versions have the feedback potentiometer for trimming the baseline injector duration in idle program.
The listed ones above are all hot wire versions.
LH 3.1, 3.2, and Motronics 4.3 and 4.4 have the hot film version.
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