P0401 and P0135 errors

I have a 2000 CV6 Camry that was getting P0401 errors. I took the EGR valve off, sprayed it with carb cleaner, and let it soak for a few hours.

After getting a couple more P0401 errors they stopped. Shortly after I started getting P0135 errors.

Is the O2 sensor bad, or is it related to the P0401 errors? What should I do?

p0135 is the bank 1 sensor 1 O2 heater circuit and its most likely a bad O2 sensor but you might also want to test all the fuses. not sure what one supplies power to the O2 heater

Also check the wiring for hungry rodents,(good luck)