lateley my air pump make a bub,,bub,,,sound 4,, about 5,min,, only at stard up in the morings,, or after i park the car 4about 8,hr, this has be going on 4,about 3,week,s now my check eng lite is on and stay on ,,do any one know the excate part,s nuber,,,4 that air pump ,,,1994 s/420 and would replaceing,,,,,the air pump make the check eng,, lite go off, thank,s mel dwyer 1994 s/420

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meldwyer