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P0400 after 7mm hole plate

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  • P0400 after 7mm hole plate

    Hello from the "other side of the world"(Finland).

    I have a Prado 2012 150 with D4D. Few weeks ago I did the EGR clean and installed a plate with 7mm hole. In my car the EGR was electronic so I had to take the egr cooler off so I could get the elbow removed and cleaned. When the EGR cooler was in my hand I noticed there was a little crack in the weld of the bybass tube where some of the exhaust gases had been leaking out.
    Since I was going to but the plate in anyway I figured I will not do anything to the crack.

    After the EGR clean everything was okay until one day after the car had been on idle for a quite long time I got the code P0400. The code has come up in maybe 4 times in this past 1.5monts even tough the car is driven every day.

    Is it possible that because of the leak from the egr cooler bybass tube + 7mm plate, there is not enough gas flowing and that will give the P0400 code?
    Or what could be the cause of the code?

    Attached the Freeze frame data.
    Last edited by Sledgeh; 24-11-2021, 07:04 PM.

  • #2

    Little update if someone would have any ideas where the problem is.

    I took the EGR cooler off and my friend welded it. He told me that it was very tricky to weld but he was able to weld most of it. When pressurized and with soap water you could still see little ubbles. I mounted a big amount of exhaust putty to block any small leakages. I also drilled 8mm hole to the EGR blocking plate to compensate if there is small leaks from the cooler. So I but everything back and went for a test drive. Positive was that I was able to get rid of annoying raddle/whining noice. Downside was that the P0400 code was still there.

    I investigated it bit more and found out that the code only comes when engine is in normal running temperature(around 80C) and when you lift the accelerator pedal and deaccelerate.

    Click image for larger version

Name:	P0400.jpg
Views:	30
Size:	88.9 KB
ID:	761423
    Attached Files


    • #3
      Here is the Freeze frame data from another time the code was stored.
      Click image for larger version

Name:	P04002.jpg
Views:	33
Size:	95.9 KB
ID:	761425


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