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My 2000 buick check engine light is on code,0102,0121,

The scanner is putting out codes 0101,0102,0121

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Ned a LOT more info. I'll give it a shot:
Mass air flow sensor.

If the engine idles OK,find it first and rap on the sensor with a screwdreiver handle once and listen to the engine's RPM.

If it stumbles,replace the sensor. Hit it,again.

Posted on Nov 12, 2014

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