Code P0138? Getting a check engine light on?

We only handle one problem per thread so please start a new question for the VSC, and 4WD light on because the Code P0138 will not affect the other warning lights.

Code P0138 in the context of a 2007 Toyota RAV4 (or many other vehicles) refers to "O2 Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2).

So, with the voltage high it means there is air getting into the system so I would check for an exhaust system leak, this guide can help:

https://www.2carpros.com/articles/step-by-step-guide-how-to-check-for-an-automotive-exhaust-leak

If no leaks are found the next step is to replace the catalytic converter or I have seen people install a spark plug extender where the oxygen sensor goes to help confirm the bad cat. Check out the images (below). Please let us know how it goes.

Yep, if you use a spark plug extender and the light stays off then you know the cat is bad.

https://www.autozone.com/ignition-tune-up-and-routine-maintenance/spark-plug-non-fouler/p/dorman-spark-plug-non-fouler-42006/720805_0_0?spps.s=5905&cmpid=LIA:US:EN:AD:NL:1000000:GEN:19502231967&&CATARGETID=120054150001287257&CADevice=c&gclid=Cj0KCQjw1OmoBhDXARIsAAAYGSFqkHQ_ypfF9Gr35HtMAgyWR_d-zDKYshZ4BAXCmG3ASqy1h3Ul9vkaApudEALw_wcB&gclsrc=aw.ds

let me know if the code stays cleared.

It should, good luck with the repair.