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1994 Mercury Cougar P0402 code

Tiny
VEGASCHUCK
  • MEMBER
  • 1994 MERCURY COUGAR
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Hi. Keep getting a P0402 code even after changing EGR valve and all sensors regarding EGR valve including 02 sensors(4) and replacing Gas cap. What are we missing. Last tine we reset code. Light came on after driving 1 mile on the next restart. Before that car went 1 week and 100 miles before coming on.
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Monday, April 5th, 2010 AT 6:09 PM

5 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Maybe faulty Differential Pressure Feedback Electronic Sensor. Check vacuum lins for blockage or leaks.
If good then DPFE could be faulty.


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_433.jpg


Hope this helps
Thanks for donate
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Tuesday, April 6th, 2010 AT 8:08 AM
Tiny
VEGASCHUCK
  • MEMBER
  • 7 POSTS
Replaced DPFE sensor today. Reset check engine light. Check engine light came back on after 3rd start with P0402 code again after driving 2 miles ( and 3 starts)
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Thursday, April 15th, 2010 AT 3:23 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hoses check good? Remove EGR valve make sure it is seated. Clean carbon off pintle and passageways.
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Friday, April 16th, 2010 AT 10:51 AM
Tiny
VEGASCHUCK
  • MEMBER
  • 7 POSTS
Where do I find Pintle valve?
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Saturday, April 17th, 2010 AT 5:40 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Part of EGR
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Monday, April 19th, 2010 AT 4:38 PM

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