One problem related to gas recirculation valve (egr valve) has been reported for the 1999 Honda Odyssey. The most recently reported issues are listed below.
Consumer stated while driving, the check engine light illuminated, consumer was then informed that bad fuel may have been used, and the dealer cleaned the egr system, however several weeks later consumer received a noticed regarding the pcv and egr clogging, consumer then petitioned the dealer for a refund, and was susequently reimbursed.