Check Engine Light Due to Faulty Pruge Solenoid on Lexus RX300

Intermittent failure of the purge control valve in the evaporative emissions (EVAP) system may cause the Check Engine Light light to illuminate.

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Average mileage: 141,084 (79,000–269,000)
5 model years affected: 1999, 2000, 2001, 2002, more2003
12 people reported this problem
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problem details
Pulling a Evap leak PO441 and PO450. I think it may be due to a faulty gas cap, but the problem is intermittent. any ideas guy's?
2000 Lexus RX300 180,000 mi,
Engine lights on, got diagnosed as faulty pruge valve. Haven't resolved the problem yet.