What is the emissions system problem on the honda odyssey 2018?

The emission system problems in a 2018 Honda Odyssey are usually related to the EGR valve failing. But what is the role of the EGR valve In a nutshell, the EGR is there to reduce emissions. It does this by rerouting some of the exhaust gases coming from the engine back into the combustion chambers in the engine. This has the effect of reducing the temperatures within the combustion chambers.The average cost for EGR valve replacement is between $336 and $427. Labor costs are estimated between $86 and $108 while parts are priced between $250 and $319. This range does not include taxes and fees, and does not factor in Your unique location. Related repairs may also be needed.