Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.