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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...   2020 suburban new transmission and issues after install recently had the transmission fail at 11...   Caliper piston post cleaning won't screw in Hello, 2013 Hyundai Elantra limited (ma...

Search Auto Parts Search 2000 Expedition V8 Code P0401 Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes comnavguy User Jun 12, 2011, 12:56 PM Post #1 of 5 (8243 views) 2000 Expedition V8 Code P0401 Sign In 2000 Ford Expedition. 4.6L V8 with 137,000 miles shows P0401 EGR flow insufficient. I have replaced the EGR valve, reset the codes, driven the vehicle over 40 miles and all I/M monitors are OK and Code P0401 came back. What else could cause that code to set? Hammer Time Ultimate Carjunky / Moderator Jun 12, 2011, 2:07 PM Post #2 of 5 (8239 views) Re: 2000 Expedition V8 Code P0401 Sign In It's going to be a bad DPFE sensor or a plugged up passage in the throttle body. The DPFE is most likely but try applying vacuum directly to the valve at idle to see if it tries to stall. If it does, the passage is good. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. comnavguy User Jun 13, 2011, 9:48 PM Post #3 of 5 (8217 views) Re: 2000 Expedition V8 Code P0401 Sign In Thanks again and again for your help! This particular Ford engine doesn't like water anywhere near the number 8 cylinder. Spraying the engine off with a low pressure hose caused misfire on 8. Hammer Time Ultimate Carjunky / Moderator Jun 14, 2011, 2:56 AM Post #4 of 5 (8212 views) Re: 2000 Expedition V8 Code P0401 Sign In No engine likes water but what does that have to do with a PO401? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Discretesignals Ultimate Carjunky / Moderator Jul 9, 2011, 10:48 AM Post #5 of 5 (8086 views) Re: 2000 Expedition V8 Code P0401 Sign In More than likely the DPFE is the cause as HT stated. The aluminum ones would corrode inside from the moisture and acids in the exhaust. Also inspect the DPFE hoses. Make sure they aren't broken or plugged up with corrosion. If you have to replace the hoses, use hose specifically for the DPFE. Normal rubber hose will disintegrate with exhaust heat and gases. Don't get the REF and HI hoses switched and make sure you feel exhaust come out of the hoses when you rev the engine. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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