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1998 Mercury Marquis Check Engine Light

Tiny
JOSHLIN1932
  • MEMBER
  • 1998 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
I get a code P0401. The Air Flow system has been cleaned from the air filter to the indake manifold. Replaced the EGR Valve and solenoid. Reset the computer and in about 30 miles the Check Engine Light comes back on. I am at my wits end.

Thanks

John
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Tuesday, August 24th, 2010 AT 1:26 PM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The most common cause of that code is a bad DPFE (Differential Pressure Feedback EGR) sensor sometimes called a pressure transducer.


https://www.2carpros.com/forum/automotive_pictures/561653_DPFE_sensor_1.gif

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Tuesday, August 24th, 2010 AT 1:54 PM
Tiny
TOMMYG524
  • MEMBER
  • 1 POST
Please advise how you, as you say, "reset the computer " in your 98 marquee. Thanks so much, tommyg524 aattyyaahhooddottccommm.
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Monday, December 12th, 2011 AT 2:52 PM

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