Error codes from the "Check engine" code reader

1997 TOYOTA T-100
254,000 MILES
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TOYOTA GUY
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What causes the Emmission pressure switch or Charcole canaster to trigger the check engine light to come on. what is involved in repairing the error codes 441 and 450?
Jan 7, 2012 at 12:15 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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