I have a '99 Corolla, with approx. 114k miles on it. A few days ago the engine light came on (for the first time ever), so I took off the gas cap and re-tightened it. Still on, had the codes read, P0446, P0441. When I searched for answers online it looked expensive, so I started with the cheapest thing first. I replaced my PCV valve, it was over due to be done anyway. I reset the light also, and drove approx. 20 miles, back on, darn! What are the consequences if I don’t replace the charcoal canister and VSV valves (have you seen where this thing is located-insane!!) I’m not due for inspection for almost another year, please help.