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Randall    (Cheeko)
Randall (Cheeko), Certified Mechanic Ford Motor Co.
Category: Ford
Satisfied Customers: 2395
Experience:  18 years as a Ford tech and still going
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Check engine light on codes 401 and 402 indicated what

Resolved Question:

check engine light on codes 401 and 402 indicated what is proable cause
Submitted: 10 years ago.
Category: Ford
Expert:  Randall (Cheeko) replied 10 years ago.
HiCustomer Thank you for asking your question on Just Answer. The other experts and I are working on your answer. By the way, it would help us to know:

-What year is your Ford?
-What model is your Ford?
-How many miles are on your Ford?
-What type of engine is in your Ford?
-What have you already tried?

Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
Customer: replied 10 years ago.
Reply to Cheeko's Post: 2001
f150
113956
4.6 triton v8
checked egr valve for carbon buildup (none)
Expert:  Randall (Cheeko) replied 10 years ago.

Hi, there was a TSB(listed below) for these codes there is a updated DPFE sensor for repair the issue , thanks

TSB
04-11-1
  • DRIVEABILITY - STREAMLINED DIAGNOSTIC PROCEDURE FOR VEHICLES WITH MIL ON AND DTCS P0401, P0402, P1400 OR P1401 - ADDITIONAL SYMPTOMS MAY INCLUDE RUNS ROUGH, LACKS POWER, SURGE, POOR FUEL ECONOMY
Publication Date: May 25, 2004

FORD:2000-2002 TAURUS
2001-2002 CROWN VICTORIA, FOCUS, MUSTANG
2001 EXPLORER USPS
2001-2002 E-SERIES, ESCAPE, EXPEDITION, EXPLORER SPORT TRAC, EXPLORER SPORT, F-150, RANGER, WINDSTAR
2002-2003 EXPLORER
LINCOLN:2001-2002 TOWN CAR
MERCURY:2000-2002 SABLE
2001-2002 COUGAR, GRAND MARQUIS
2002-2003 MOUNTAINEER

This article supersedes TSB 04-3-1 to update service part information and applications.

ISSUE:

Some vehicles may exhibit a malfunction indicator lamp (MIL) "ON" with or without the following symptoms: Rough Running, Lack of Power, Surge or Poor Fuel Economy, along with diagnostic trouble codes (DTC's) P0401, P0402, P1400 or P1401. This may be caused by an intermittently functioning tube-mounted delta pressure feedback EGR (DPFE) sensor (Figure 1).

ACTION:

For vehicles equipped with a tube-mounted DPFE sensor, perform the following diagnostic procedure and repair action. This procedure supersedes the diagnostic procedure in the PC/ED Manual for the issue described above.

NOTE:ALL LISTED APPLICATIONS CAN NOW BE SERVICED WITH DPFE SENSOR 4U7Z-9J460-AA

 

graphic

Figure 1 - Article 04-11-1

NOTE:THIS ARTICLE APPLIES TO THE FULL MODEL YEAR FOR ALL VEHICLES LISTED EXCEPT THE FOLLOWING:

  • 2002 Taurus/Sable 3.0L DOHC - Built After May 2002
  • 2002 Taurus/Sable 3.0L OHV - Built After February 2002
  • 2002 Econoline And F-150 4.2L OHV - Built After April 9, 2002
  • 2003 Explorer 4dr/Mountaineer 4.6L SOHC - Built After February 2, 2003

SERVICE PROCEDURE

  1. Retrieve continuous DTC(s).
  2. If P0401, P0402, P1400 or P1401 are present, turn ignition OFF and replace the DPFE sensor.
  3. Clear continuous DTC(s).
  4. Perform key on engine off (KOEO) and key on engine running (KOER) self-test.

    ENGINE APPLICATION CHART
    Model YearVehicle LineEnginePart
    2001-2002Cougar2.5L DOHC4U7Z-9J460-AA
    2001-2002Crown Victoria/Grand Marquis4.6L SOHC4U7Z-9J460-AA
    2001-2002Econoline4.2L OHV4U7Z-9J460-AA
    2001Econoline4.6L SOHC4U7Z-9J460-AA
    2001-2002Escape2.0L Zetec and 3.0L DOHC4U7Z-9J460-AA
    2001-2002Expedition4.6L SOHC4U7Z-9J460-AA
    2002-2003Explorer 4dr/Mounaineer4.6L SHOC4U7Z-9J460-AA
    2002Explorer 4dr/Mountaineer4.0L SOHC4U7Z-9J460-AA
    2001-2002Explorer Sport4.0L SOHC4U7Z-9J460-AA
    2001-2002Explorer Sport Trac4.0L SOHC4U7Z-9J460-AA
    2001Explorer USPS4.0L SOHC4U7Z-9J460-AA
    2001-2002Focus2.0L Zetec4U7Z-9J460-AA
    2001-2002F-Series4.2L OHV and 4.6L SOHC4U7Z-9J460-AA
    2001-2002Mustang3.8L OHV4U7Z-9J460-AA
    2001-2002Ranger4.0L SOHC4U7Z-9J460-AA
    2000-2002Taurus/Sable3.0L DOHC4U7Z-9J460-AA
    2001-2002Taurus/Sable3.0L OHV and FFV4U7Z-9J460-AA
    2001-2002Town Car4.6L SOHC4U7Z-9J460-AA
    2001-2002Windstar3.8L OHV4U7Z-9J460-AA
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