jashtiani

I have a 2000 Lexus ES300. It has over 290,000 miles on it. I received an engine check light over a month ago along with the stability control off. I received the following codes when I had it read at AutoZone:

C1201 - Engine Communication Circuit
P0440 - Evaporative Emission System
P0441 - Evaporative Emission System, Incorrect Purge Flow
P0446 - Evaporative Emission System, Vent Control Circuit

I don't do maintenance or repairs on my cars personally, but it would be great for someone to help me determine what the problem is, how I could fix it myself or how much it should cost if done by a shop.

Thanks for your help in advance!

Richardsr

From another thread here on ClubLexus with the same codes... “These are the 3 codes you get when the evap hose is disconnected behind the air filter box.”

https://www.clublexus.com/forums/rx-...441-p0446.html

June1978

I had these 3 codes- evap hose was fine- ended up needing a new charcoal canister

P0440 - Evaporative Emission System
P0441 - Evaporative Emission System, Incorrect Purge Flow
P0446 - Evaporative Emission System, Vent Control Circuit

Richardsr

I’m glad you checked the hose connections first.

80es300

Also check the other vacuum hoses (there are some under the plastic engine cover). I once had that hose split and was throwing Evap code.