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P0410: Secondary Air Injection System Malfunction.

P1661: Copyed form here: http://www.ls1lt1.com/forum/showthread.php?p=127820
"Basically, this code means the PCM detected a fault with the MIL circuit, as has already been discussed here.

If there was a fault in the circuit that detects the fault, however, that might cause a "false positive" for this code.

If the circuits check out, the factory service manuals say the PCM needs to be replaced (the fault detection circuits are internal to the PCM)..."

P1886: 3-2 Shift Solenoid Valve Assembly CKT Electrical

There is something strange going on here with your car. I would first reset the "Check Engine" light and drive if for a while and see if it comes back and and if so then why. You may have just gotten an anomaly.
 
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