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If that 2008 is a 2wd, I’d disable the VCM. Doing so ended my emission codes permanently. Disregard if 4WD.
 

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Home of the 309k 2012 V6 Honda Crosstour
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Id replace the EGR valve.
Id also do a throttle body cleaning with a throttle reset.
I assume you have a new/clean air filter, installed correctly, box lid sealed. Intake hose is leak/crack free.
I agree, premium gas does little. I’d look for 87 octane with fuel additives (top tier).
 
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