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video shows the location of egr valve in Honda Acura 3.5l engine used in Odyssey Pilot Accord RDX MDX TL and few other models. Most vehicle has similar egr valve located near exhaust manifold and the intake plenum or throttle body. Open it up and clean the carbon. It is a good idea to replace it with a new one as intermittent EGR fault is hard to repair or prevent. Faulty egr can cause a tapping noise and the vehicle may fail emission test.
Check Honda EGR valves below. Verify fitment.
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I got 38 ohms from 1 and 3 and 22 ohms from 1 and 2
To test apply 12V to the two lower pins. They will have less than 10ohms