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?