Car is stalling. Changed the DPFE sensor and cleared code. Car still stalls and same code has reappeared. Any hints would be appreciated. If the EGR valve or tube is contaminated with carbon, would this cause the car to stall?
2006-12-20 05:46:32 · 0 answers · asked by mtbman1016 2 in Cars & Transportation ➔ Maintenance & Repairs
P0401 means exhaust recirculation flow is insufficient. The sensor is reading the EGR valve stem not moving as far as it is required to satisfy the computer parameters. Did you check to see if you had the correct reference voltage, and the proper ground on the connector? I believe you should have no less than .5 volts on the reference side. If you don't then you must find where it is loosing power, or suspect the ECM being bad. Fords are bad to clog the EGR valve up and it has been my experience to replace the EGR at the same time, due in part that you just can't clean them to work properly after they go bad. When you have it off, clean out the holes with whatever it takes to chip the stuff out of there, and then blow it out real good with an air hose. Watch your eyes, as this stuff will get in them in a hurry. Use a small amount of clean engine oil on the new gasket, and some anti-seize on the bolts. Make sure you aren't loosing vacuum from any of the hoses that plug on to it or anywhere else on the engine. Pay close attention to the area where the hoses plug on, as this is where they will split, and they will look good, but not be. If you do this, and reset your computer you should be fine.
Glad I could help you. Good Luck!!!
2006-12-20 07:05:40 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Your "P0401 Insufficient flow" is just that, not enough exhaust flow for the PCM's command.
The DPFE MAY have been a problem, but now you have a spare. There are other causes for this code, and in relation to your stalling, it could be a EGR valve that won't move (Seized) either to close or open.
There could be command issues, or perhaps some of the sensors are slightly out of range.
Begin with inspecting the EGR valve and the ports. Be certain that the EGR valve will function correctly and that it will seat its pintle (no-flow).
The BEST procedure is to purchase the repair manual, or at least go to the Library, in the REFERENCE section and use theirs. Follow the diagnostic trouble-tree. If you do, there is less chance of purchasing more spare parts, and a better chance of repairing the problem and not merely the symptom.
Good Luck and Merry Christmas
2006-12-20 06:29:39 · answer #2 · answered by Ironhand 6 · 0⤊ 1⤋
P0401 Ford
2016-10-02 03:54:52 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Confirmed Fix
Vehicle Description: 2001 Ford Focus LX 2.0L
Mileage: 91000
Customer Concern: Malfunction Indicator Light (MIL) on setting code P0401. New Differential Pressure Feedback EGR (DPFE) sensor. Differential Pressure Feedback EGR (DPFE) sensor voltage is .92 volts and increases to 1.6 volts when opening the Exhaust Gas Recirculation (EGR) valve at idle and engine RPM only changes slightly. Voltage changes to 4.5 volts when pulling 9" of vacuum on the reference (REF) port of the Differential Pressure Feedback EGR (DPFE) sensor.
Tests/Procedures: Inspect Exhaust Gas Recirculation (EGR) valve for proper function. Remove throttle body and inspect for carbon restriction at the point of exhaust flow into the intake from the Exhaust Gas Recirculation (EGR) valve.
Potential Causes: Exhaust Gas Recirculation (EGR) valve. Carbon restriction in the Exhaust Gas Recirculation (EGR) passages of the intake manifold.
Tech Tips: Sensor voltage should be .5 - 1.2 volts with a closed Exhaust Gas Recirculation (EGR) valve. When the Exhaust Gas Recirculation (EGR) is opened, the RPM should drop severely and the Differential Pressure Feedback EGR (DPFE) sensor voltage should increase to over 4.0 volts.
Diagnostic Codes: P0401, P1408
2006-12-20 09:49:10 · answer #4 · answered by russ G 3 · 0⤊ 1⤋
--->> Tips---> https://trimurl.im/g72/2001-ford-focus-2-0-p0401-code
2015-08-04 16:59:09 · answer #5 · answered by Anonymous · 0⤊ 0⤋