Need help with OBD-II Code 0401 then 0402
#1
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.
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.
#3
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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.
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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