WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
For circuit description and possible causes, see Fig 1 and Fig 2
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Fig 1: DTCs P0120, P0122, P0123, P0220, P0222, P0223 & P2135 Circuit Description & Possible Causes (1 Of 2)