You have to diagnose the entire EGR system, not just the EGR valve. Sometimes after several years, the EGR exhaust input and intake manifold passage ways get clogged up with carbon deposits and the only way to fix the insufficient EGR flow is to disassemble the components and clean the passage ways. Don't just automatically replace the EGR valve! That's not what the error code is necessarily an indication of.
http://www.troublecodes.net/articles/myt鈥?/a>
"There is a number of scan tools and software available that can scan the vehicle's computer for trouble codes. However, you need to have some technical knowledge to diagnose the problem; the trouble code itself does not tell exactly which part to replace. For example, the code P0401 reads "insufficient EGR system flow", but it could be set for a number of reasons, such as bad EGR valve, clogged EGR passage or, for example, a faulty DPFE sensor (Ford F-150 common problem) - there is a specific test procedure to be performed to pinpoint the problem part. Where to find specific test procedure and where to buy a scanner - read below."
http://www.samarins.com/diagnose/checken鈥?/a>|||You need an EGR valve also have the hoses to the valve checked.|||That would be the EGR valve - pretty common repair.
If you've got a honda (that's not a Passport )w/ less than 150,000miles and is not more than 14 years old it is covered by the emmissions warranty. Check out bulletin 98-081 for parts list.|||take the valve off and start engine. it will blow the carbon plug out then put your EGR valve on again buy a new gasket for it|||The EGR valve, which controls that flow, has probably failed.|||EGR valve
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