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Old 03-17-2010
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Icon8 CODE 401 for ever

Hello all, I have 1995 2.3 ranger and i have a CEL light on for about a year. got it read and code 401came up. they wanted to charge me 900.00 dollars to do all this that i have already done. Replaced egr and its sensor, cleaned egr tube with carb cleaner, ran seafoam, replaced hoses to sensor and nothing. Code keeps coming up. I have cleared the code by unplugging negative cable for hours. what can it be? I plan on removing upper intake and cleaning carbon buildup at port where it attaches to egr valve. but hesistant because of throttle cable. What do u all think?
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Old 03-17-2010
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i would say it is the DPFE (differential feedback pressure egr) sensor
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Old 03-18-2010
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i have already replaced dpfe sensor. Should i return it to auto zone and get another? Someone told me it may be the o2 sensor or cat converter, but i told them code did not pop up for that. what u think?
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Old 03-18-2010
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i dont think the o2 sensor would throw a code for EGR
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Old 04-08-2010
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IT IS THE DPFE. YOU HAVE TO USE THE MOTORCRAFT DPFE TO CLEAR THE CODE PEREMANTELY!!!
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Old 04-09-2010
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My dad's F150 originally had the aluminum DPFE sensor when it failed, and replacement was plastic. I went through about 6 different plastic DPFE sensors, from AZ to OEM, and they all failed within a few weeks or months. I finally went to a salvage and bought a USED aluminum sensor...and the code never returned.
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Old 05-20-2010
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fixed code 401

Just to let you guys know with the same 401 code. it was my upper intake that was clogged with carbon. had a friend remove intake and clean it with carb cleaner. stuff was hard like a rock. so for future 401 codes be advised insufficent flow means it clogged and you have to remove the carbon buildup in the upper intake before you replace all that stuff that i did before. I passed emissions and did not have to pay precision tune the nine hundred dollars thay qouted me. yeeepeeeee!!!!
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Old 05-21-2010
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Thanks for posting back your fix!

*A lot of people don't take the time
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