Are you sure the EGR valve is bad? I have a 96 Paseo and thought I needed a new 1 but the only problem was insufficient air flow, after soaking it in carb cleaner and blowing out all the gunk(carbon build-up) it worked fine and I was able to put it back on the car. Good luck.
Yes, the products of CH4 + O2 (Methane + Insufficient Oxygen) are water and carbon monoxide.
burning with insufficient oxygen........
When Carbon reacts with an insufficient supply of oxygen, bonds form and create CO (carbon monoxide)
Carbon monoxide is produced when a fuel is burning with an insufficient oxygen supply.
When methane burns in the presence of insufficient oxygen, incomplete combustion occurs, leading to the formation of carbon monoxide instead of carbon dioxide. Carbon monoxide is produced due to the partial oxidation of methane in limited oxygen supply. This reaction is less favorable as it produces a toxic gas, unlike complete combustion which forms carbon dioxide.
P0401 indicates an insufficient flow of gases through the EGR system. While Honda EGR valves occassionally fail, your first step should be to check if the EGR is operating when vacuum is applied. If so, remove it and clean the orifice with brake cleaner. While you have it off, clean the intake porting with carb cleaner and a stiff wire brush. Carbon build up in either the EGR or the intake will set this code.
Carbon is clogging the egr port.
The 'problem' of 'this problem' is not understood.
Yes, one of the symptoms of insufficient oxygen levels can be headache.
Fossil fuels emit carbon dioxide which leads to the greenhouse effect, power stations have to purchase emissions, EUAs now to offset this. A cleaner future is possible with nukes and solar/wind power. Gas is the least pollutant of the fossil fuels
We have a carbon tax to encourage polluters to reduce the amount of carbon dioxide they emit. If they have to pay for it then they will search for cleaner and greener ways of running their industries.