Secondary Air Injection Error on 2002 Buick Rendezvous

Ive have the secondary air injection code come up on the code reader. I reset it once and about 4 days laterit came up again. It only comes on after the vehicle has been driven for over 20 miles. I hear the pump running when you 1st start the car then after warming up it stops. Where is the secondary air valve located? Could it be the pump?

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2 answers
Does the secondary air injection code on your 2002 Buick Rendezvous specify bank 1 or bank 2? If only one bank has failed then chances are the pump is good. If the code is a system failure where both banks are affected then the pump could be at fault. A good starting point would be to check for proper air flow from the pump at the check valves. You can test this while the pump is running during warm-up.
your secondary air pump is shot its found only at deallers they run any where from 200 to 400 dollars