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Normal I believe. That pump runs almost immediately after a cold-start, and I believe is programmed to run 2 minutes. Then it's off. That's when the pump is actually doing the job it's supposed to do. THEN later on (when the conditions are just right) the pump will come on again for a very brief period. The engine computer is testing the air pump, it can see the change in the O2 sensor,so it knows it works OK.
Gilly
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