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Where is the purge valve and canister located? I have a P0456 that comes and goes. The last time the CEL went out all by itself and stayed out for about 3 months untill I had to disconnect the battery and it came back on 3 days later with the P0456 code. While the CEL is out the OBDII reads MIL-OFF, No codes, EVAP not ready.
According to the manual, the first possible causes of P0456 to check are a loose fuel filler cap or defective fuel cap seal:
If you need to go beyond that, the Evaporative Emissions system description and testing procedures begin on page 2130 of the Powertrain section of the X350 Workshop Manual, which you can download in six sections from this forum:
Purge valve
