p0402 code

2002 LINCOLN LS
128,000 MILES
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SUNSEEKER
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  • 1 POST
I have ls 3.9 the p0402 code keeps haunting me. I have replaced the left bank 02 sensors, egr valve and the egr pressure sensor. The car run great with no hesitation so I don't think its a cat. each time I have replaced a component I have disconnect my battery to reset the code, and it keeps coming back.
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Dec 1, 2011 at 4:05 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
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first, i would verify both vacuum and exhaust are present at the egr valve. if one is missing, it needs to be repaired.
did you mean the dpfe sensor?? this is a common failure.
does the solenoid work? and if it does, does it pass vacuum and open the valve??
there is a lot to this system and you need some help from a shop. throwing parts at it is expensive and most likely wrong.

Roy
Dec 2, 2011 at 4:08 AM
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