Toyota codes P0031 P0051 only changed blown fuse to fix, (bank 2 sensor 1) (bank1 sensor 1) also fixed the VSC light and Trac Off light just by changing the oxygen sensor fuse. It's known as A/F air/fuel, fuse, relay on the fuse box. There's a fuse and a relay, check them both. Hopefully your problems stop there.
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