So I have had the error, like I'm sure many have had, for more than 2 years. Well, it's time to get a smog check again, but this code keeps coming back up and as one would guess fails the secondary air check. This is the only code I get. What I have done so far: Validated vacuum lines are good using hand vacuum (a few times). Validated the Air Injection bypass solenoid is working both out of the car and in the car. Turns on and enables the vacuum to route to the AIRD. Validated vacuum to the AIRD is more than 10 psi. (Can't remember the exact value.) Validated the AIRD is working. With the car off, applied 5-15 psi to the vacuum port of the AIRD, on the Air Pump inlet I applied ~15 psi air. With vacuum applied no backpressure. Validated the Air Pump is working. It was working, but I replaced it with a junk yard pull off a '99 a year ago. Every time the car starts up the pump turns on and I can feel suction. Validated operation of motor by using Mode-6 command to turn it on. Setup my Torque app to monitor the AIRM. At least when I'm sitting still (which is about the only time it comes on) I hear the pump turn on and off with my monitor. I'm at a loss what to do next outside of bypassing it with a tune.