nb7275 Posted December 20, 2011 Share Posted December 20, 2011 Bought a 1999 RX300 a year ago. Engine light came on a few months after purchase and code P0440 was indicated. After diagnostics, had new charcoal canister installed, all hoses checked, everything good. Engine light comes on again a couple months later, same code. Couple things were tightened, but nothing serious. Repeat - light and code. Nothing was found. Reset code. Mechanic (Firestone and qualified) said I should probably go to Lexus dealership because their code reader is more detailed for Lexus products and they might find something else. Engine light came on again - same code. Went to Firestone, had it reset to see how long before light came on again. 3 weeks later, light comes on. same code. I haven't reset it yet, thought I'd write something here to get any other ideas. I think the gas cap is ok, and I make sure I set it tight after adding fuel, but I could get a new one and see if that helps. Any other ideas? Quote Link to comment Share on other sites More sharing options...
brianj2000 Posted March 9, 2012 Share Posted March 9, 2012 Lots of time has passed since your post, so I assume you replaced your gas cap. If not, the following extract from '99 repair manual might help: "Possible causes are: * Faulty vapor pressure sensor. * Fuel tank cap installed incorrectly. * Fuel tank cap defective. * Damaged, disconnected or blocked vacuum hose. * Fuel tank damaged. * Charcoal canister damaged. * Hose between fuel tank and charcoal canister damaged." I just replaced the original cap on my wife's 12-year-old RX...less than $7 for a Motorad version. Quote Link to comment Share on other sites More sharing options...
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