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Second time, 3 weeks apart, no symptoms in the car at all, code P1491, EGR and Valve function are fine, mechanic could find no problems, Odyssey 2000 76 K miles,
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Stop using it & take it to a repair shop If you got codes,why would you continue to use the car for a week or more ,verse using the codes to diagnose the problem?
Code P1491 in Honda/Acura vehicles means insufficient EGR valve lift. Note - this is not the same as 0401 for EGR low flow when you have to clean EGR passage in the intake manifold. If code 1491 is not accompanied with 0401 - that could be faulty EGR valve itself. Try to reset the code, and if it will return soon - replace EGR valve. If, however you see both codes together - cleane the manifold passage before you replacing the valve.
Its either a faulty EGR valve or it has carbon build up inside.Take valve off and clean carbon out using a non-chrlonated brake cleaner and wire brush.
I would clear the code and see if it returns. If the EGR valve is stuck open, it would make it buck or shutter. If the EGR valve is not functioning right, or clogged up, it will effect proformance. I would replace the EGR valve. I read that it's a common problem.
P0401: Isufficient Flow Detected in EGR system.
-clean the EGR port with the carburetor cleaner.
-clean the EGR passage inside the EGR valve with the caburetor cleaner.
Reset the light, if the light still coming back, then replace the EGR valve.
Code P1491 is not the PVC Valve.It is the Vacuum Cut Valve Bypass Valve. Which is located above and away from the egr canister under the driver side
rear bumper it is round and have about 3 hoses connected to it. if it is
from a check engine light that says look at vacume cut valve check the
egr canisters purge valve some times they stick and throw the wrong
code
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