Originally Posted by pmilnes
Hi there,
My brother's 2000 Odyssey had a check engine light on, the code was p0401.
I had the exact same code on my 99 accord ex, so I replaced the EGR valve. Reset the light, no problems since.
I repleced the EGR in his van, reset the light, and a few days later the light came back on - same code.
Any ideas?
You probably just screwed him out of $150. It's very rare that the EGR valve needs replacing itself, as the electronics in it are sound. Typically, the ports in the intake manifold and block get clogged up from carbon. The only way to fix it is to remove the manifold, clean it up, and put it back together.