Check Engine Light Due to EVAP System Failure on Lexus IS300

Occasionally, the Check Engine Light is illuminated due to failures in the evaporative emission (EVAP) system. Our technicians tell us that proper diagnoses is generally required to confirm the exact fault causing the warning light to come on.

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Average mileage: 139,088 (89,123–185,000)
5 model years affected: 2001, 2002, 2003, 2004, more2005
19 people reported this problem
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problem details
2001 Lexus IS300 135,000 mi,
check engine light on displaying p0440, p0446
2002 Lexus IS300 120,000 mi,
I have check Engine light problems since last 11/2 years. Change sensor in Tank, gas cap, and recently changed charcoal canister. Light wasn't there for last 10 days and now same problem starts again.......
Checked system & code read EVAP System Failure (Small)
2001 Lexus IS300 180,000 mi,
MIL/CEL usually comes on and pulls the same code when I am about to run out of petrol.
2004 Lexus IS300 170,000 mi,
Both the check engine light and track auto light was on for last year, per Lexus, needed catalytic converter and oxygen sensor replace - $4000 to replace by Lexus
2001 Lexus IS300 185,000 mi,
This started happening after a tune-up at a local Meineke. They basically gave up on finding the leak. I've had to play some games to pass inspection (reset ecu, complete a drive cycle, get it inspected prior to light coming back on).