1997 Toyota Landcruiser Check Engine Light OBDII code P0401

Tiny
1997LNDCRUZER
  • MEMBER
  • 1997 TOYOTA LANDCRUISER
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 103,000 MILES
What can I do to fix this. I have replaced hoses and the filter in the EGR.
Keep it simple and if there are any pictures so I can identify the correct parts I have a 1997 Landcruiser
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Tuesday, February 19th, 2008 AT 4:09 PM

5 Replies

Tiny
BLACKOP555
  • EXPERT
What is the exact code all you say is P040
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Tuesday, February 19th, 2008 AT 8:19 PM
Tiny
1997LNDCRUZER
  • MEMBER
Oops it is Error Code P0401?
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Wednesday, February 20th, 2008 AT 3:17 PM
Tiny
BLACKOP555
  • EXPERT
Alright thats better :D

Simple code, it means EGR flow is insufficent.

First take off the egr valve and clean its ports and the ports on the manifold really well till its pretty well clean. Then install a new gasket, after the old one is removed and the mating surfaces clean of course!

Second if the above doesnt work Try manualy giving the Vaccum to the EGR and seeing if it opens up and runs good, if it does then you have insufficent vaccum to it and the lines shoudl be checked.

Third The DPFE sensor or the EVP sensor is bad and you should have those checked by a mechanic or dealership.

Fourth, the EGR is just simply bad.
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Wednesday, February 20th, 2008 AT 8:36 PM
Tiny
1997LNDCRUZER
  • MEMBER
Thank you for you reply.
I went ahead and did a vacuum test on the EGR Vacuum Modulator Valve and I had flow into the A chamber, the port on the bottom. When I cleaned it out with air, the light stayed out. I replaced it anyway since it had a leak and changed some of the vacuum lines and the PCV Valve and hoses. It has been a week with no check engine light. Thanks for the input, it really helped me focus on the "right" area.
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Tuesday, February 26th, 2008 AT 8:30 AM
Tiny
BLACKOP555
  • EXPERT
Glad to hear you have found your problem. It has been my pleasure.
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Tuesday, February 26th, 2008 AT 10:37 AM

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