Need help for error code P0401, EGR insufficient flow, any idea on what to deal w/ this problem, thanks in advance.

 

Clogged EGR ports or malfunction EGR valve. Try clean the ports and test EGR valve first.

 

Hi Billyrusa,

Thank you for your immediate reply, I will try to dismantle the EGR valve and clean it first, any suggestion on how to clean it like do I have to use a cleaning reagent, any safety concern, thanks in advance.

 

Refer to this http://www.freewebs.com/hondadude/95...5AccordEGR.htm for cleaning the EGR ports.

If the procedure does not resolve the problem, Check EGR valve
If you have a vacuum pump, it will be easy to test the EGR valve.
Disconnect the vacuum hose from EGR valve. Start engine and let it idle at operaiting temperature. Connect the the vacuum pump to EGR valve. When you slowly apply vacuum to EGR valve, the car should start idle badly and going to stall. If not, you will need to change the EGR valve.

If EGR valve is ok, check EGR vacuum control valve and EGR control solenoid valve witch is controlled by ECM.

 

Hi Billyrusa,

That was a very good instructions/procedure together with a clear picture, again thank you, I will try that this weekend.

 

if you feed seafoam through a vaccume hose you can pretty much do the same thing

 

Thanks for your input, how to do that? Do you mean there's no need to perform cleaning the EGR port and instead perform seafoam feeding, can you elaborate that as you know I'm not an expert, thanks for your input.

 

Hi, Thanks for the input that you guys has given me it works, I follow the procedure of cleaning the EGR port, the error P0491 that causing the CEL to light is gone. I drove my car for two hours and after that the CEL came back and there were new error code the code is P1491, my OBDII reader dont have definitions of that code, can anyone knows what is this error code? Thanks in advance.

 

Check the vacuum lines to the EGR valve and that every connector is plug back in.

http://autorepair.about.com/library/faqs/bl260f.htm