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Need help with OBD-II Code 0401 then 0402

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Old 07-11-2005, 12:38 PM
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Need help with OBD-II Code 0401 then 0402

I got an 0401 EGR Flow Insufficient last week. I cleared it and it showed up again after a couple of days. I replaced the EGR Valve and the 0401 reappeared. I replaced the DPFE and the code did not reappear. Great!

About a week later, I got an 0402 EGR Flow Excessive. Argh! New EGR Valve. New DPFE. The hoses to and from the DPFE to the tube look decent. They don't appear to have any build up inside.

Has anyone traced their 0401 or 0402 to the tube?

My first intinct is to replace the EGR valve again, assuming the one AutoZone gave me is stuck open. Is there any servicing I can do to it first? Like maybe soak it in carburator cleaner? Or spray it with WD-40?

Thanks.
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Old 07-26-2005, 10:28 PM
MazdaRangerGuy MazdaRangerGuy is offline
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There's your answer - AUTOZONE...


Put the original EGR valve back on.. the dpfe was your only problem..

Also get a motorcraft DPFE
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Old 07-26-2005, 10:33 PM
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Unfortunately, I threw the old EGR Valve as soon as I got done installing the new one.

On the bright side, the code cleared itself.

/me scratches head...
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Old 07-27-2005, 09:52 PM
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Well, I just heard from my son. He said the CEL comes on for a few minutes, maybe 30 mins, then goes off on its own. He said this happened 3-4 times already. So, is it the EGR Valve or the DPFE?
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Old 07-28-2005, 10:00 AM
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Hard to say. But if you are still getting both 401 and 402 codes, then I think you have to suspect a component/circuit probelm as opposed to a blockage or leak.

There are a couple of excellent links covering the Ford EGR/DPFE system in detail at the Ford Scorpio site:

http://www.fordscorpio.co.uk/egrsensors.htm

http://www.fordscorpio.co.uk/egrmonitor.htm

Even though the Scorpio is not a North American vehicle, it nonetheless still uses the same exact EGR/DPFE system as that found on our Fords, so the information set forth is both accurate and relevant.
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Old 08-05-2005, 05:47 PM
MazdaRangerGuy MazdaRangerGuy is offline
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I think the original DPFE caused the P0401. I think the "zoner" EGR valve is causing the P0402. Has the 0401 returned after replacing the DPFE? Or are you just getting P0402 (Excessive flow) now?
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Old 06-14-2013, 08:14 PM
BillStevick BillStevick is offline
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a 401 on a F150 is usually the ports clogged with carbon coming off the throttle body. You have to remove the throttle body, get at the ports with carb cleaner and coat hanger. Clean em' out good, and voila, no more 401 code.
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