Periodic P0138 & P0606

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Apr 4, 2018
This weekend my wife told me that her check engine light would come on whenever the GX470 (2007) sits for 2-3 days. After driving for about 25 miles she says it goes off. Was able to pull the codes this weekend and got

P0138: O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
P0606: ECM/PCM Processor

Leaning towards a short on the O2 sensor?

For the P0606 from the forums sounds like the Secondary Air Injector System might be starting to fail? Ordered the Bypass.

Any other ideas for me to check. Vehicle is going in tomorrow for the timing belt and waterpump replacement.

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