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Engine light error codes p0455 and p0401 - 2005 Ford Freestar

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6ya6ya
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Posted on Jan 02, 2017

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dustyboner
  • 331 Answers

SOURCE: I'm getting an engine check light, the OBD-II is P0401.

I would check the front o2 sensors because usually the EGR flow is detected by:

The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.

Posted on Oct 13, 2008

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emissionwiz
  • 76649 Answers

SOURCE: P0401. P0133, P1131- emmision test

Based on what the tech manuals say I would change the DPFE sensor for the EGR Valve, careful not to tear the special silicone rubber hoses that go to it from the exhaust, as a Ford dealer tech I saw these codes allot, and the DPFE sensor was almost always the issue or the hoses going to it.

Posted on Oct 16, 2008

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