Check engine light and vsc light both on

Bad sensor bank 1 sensor 2. Possible bad catalytic converter also. Needs to be diagnosed.

if you got your air filter changed recently check for hoses that have possibly got disconnected when pulling up air filter box to fit new filter in, especially purge hose below and in rear of box

My 2006 Toyota Sienna had both engine and vac lights on. Tried to tighten the cas cap. Cleaned the gas cap and around the gas thank opening but the lights were still on. Pushed a reset button and still nothing. Brought to my mechanic and he said that he had to replace the lower oxygen sensor. Total $277.63

My 2003 4 runner and other Toyota cars will do same! The problem? Gas cap not on correctly! Why? Because system for gasoline is airtight to reduce emmissions! Fix? Take off cap rescrew on until it clicks once, then, disconnect positive battery cable for 30-60 seconds. Reattach cable lights should go off once car starts!