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OBD code P0172 / system to rich (bank one) ??? 98 S-70

anyone have an idea what might throw this code?
OBD code P0172 / system to rich (bank one)

thanks!
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    OBD code P0172 / system to rich (bank one) ??? 98 S-70

    The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
    There could be a vacuum leak.
    There could be a fuel pressure or delivery problem

    BB







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