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I see that as the secondary air injection code. Originally these cars had a small electric pump which was connected into the fittings at the top/front of the exhaust manifolds. Its a terribly unreliable pump with not much use. Most people "disable" it roughly following the GM TSB but this does require reprogramming to turn off the code.

-Brian
 

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Just bought a 96 Impala. Previous owner installed a K&N air filter. Know have the Engine light on with the PO412 and my mechanic says it will stay on. Anyone know how to get to go off?
Reprogramming the pcm permanently deactivates the AIRpump and makes all AIRpump codes
IMPOSSIBLE. Forever.
 
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