Does the code number refer to a location? I had an evap leak recently on my 1999 Honda. According to Haynes that code number said “in canister area.” I was able to diagnose a bad electrical connector at the purge valve. The valve opened and closed when I applied and unhooked battery power. The two wire female connector leading to the solenoid showed battery voltage when the engine was warmed up. I installed a new connector ($10 from Amazon) yesterday and it’s now working OK. Fingers crossed.