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The EGR value on the 1999-2004 Honda Odyssey is notorious for becoming clogged. If you are getting a P0401 code and or odd running issues then follow this guide to clean the valve.
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1999-2004 Honda Odyssey EGR Port Cleaning
The EGR value on the 1999-2004 Honda Odyssey is...
iFixit Library 1999-2004 Honda Odyssey
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No estimate
Guide 89029
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