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P0401 Prius 2010

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Mike 777, Mar 24, 2016.

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  1. Mike 777

    Mike 777 Junior Member

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    I've read many threads in here, but I didn't find problem of my car.
    It's Toyota Prius-3 2010, check engine light on and code is P0401. EGR Valve works well, I cleaned pipe, gasket, cleaned throttle plate and everything but nothing helps.
    I have (light on) it maybe 1 year or more, the light goes away and come back,I'm in Los Angeles and all they time is sunny day and weather is nice, I've seen 3 times, when i drove in rain evening and morning I didn't see light on.. then, couple days and comes again. I think maybe EGR cooler has to be replace? or I do not know why in cold weather time light goes away..
     
    #1 Mike 777, Mar 24, 2016
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  2. JC91006

    JC91006 Senior Member

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    How many miles are on your car? There is a 150k miles emissions warranty in California

    SM-N900P ?
     
    #2 JC91006, Mar 24, 2016
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  3. Mike 777

    Mike 777 Junior Member

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    now 170 000, but when first came on was 130 000 miles
     
    #3 Mike 777, Mar 24, 2016
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  4. bisco

    bisco cookie crumbler

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    did the dealer note the problem at 130?
     
    #4 bisco, Mar 24, 2016
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  5. Mike 777

    Mike 777 Junior Member

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    nope, at that time I changed battery, dealer didn't say anything.. I buy now "CRC Guaranteed To Pass Emissions Test Formula, 12 Ounces " (Powerful detergent additives super-clean your entire fuel system, reducing emissions and improving performance
    • Lowers CO, HC, and NOx emissions to guarantee a passing emissions test) I'll try that, if not i'm thinking to change EGR Culler Sub Accembly that will my last chance to fix it because it has a electrical connection and should be problem in there, but EGR Valve stick works great I do not need to change it.
     
    #5 Mike 777, Mar 24, 2016
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  6. Rebound

    Rebound Senior Member

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    There are many threads here from people who had that problem.
    One guy tried everything, to no avail. Then he disconnected his 12V battery for a few minutes, which let the code clear. The light went off and stayed off.

    Another Engine Light (P0401) question | PriusChat
     
    #6 Rebound, Mar 24, 2016
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  7. Mike 777

    Mike 777 Junior Member

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    I've read all, disconnect 11 V didn't help. The problem is, I need to pass Smog Check in here Los Angeles and that's the problem
     
    #7 Mike 777, Mar 24, 2016
  8. Rebound

    Rebound Senior Member

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    Using an OBD-II tool, you can reset the error and clear the light. If it takes two or three days to show up after it clears, you can try taking it in for smog right after you clear the error. Prius cars are super-low emission, even with this error. So there's a very good chance you'll pass.

    An OBD-II tool costs about $50. You might have a friend who has one.
     
    #8 Rebound, Mar 25, 2016
  9. Mike 777

    Mike 777 Junior Member

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    I know that way to reset, but that guy from smog check station told me don't reset, just fix it in regular way ...anyway, anyone has an experience how to replace EGR cooler assembly? It need to be in specific position or angle, any video or recommendation I will appreciate.
     
    #9 Mike 777, Mar 25, 2016
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  10. jdcollins5

    jdcollins5 Senior Member

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    Have you checked the Manifold Absolute Pressure sensor? That is is one of the possible causes for the DTC.
     
    #10 jdcollins5, Mar 25, 2016
  11. Mike 777

    Mike 777 Junior Member

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    If you mean MAF sensor it also changed, I think my Prius 3 generation does not have MAP sensor.
     
    #11 Mike 777, Mar 25, 2016
  12. jdcollins5

    jdcollins5 Senior Member

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    I meant MAP. I have the same car and it does have a MAP sensor.
     
    #12 jdcollins5, Mar 25, 2016
  13. Mike 777

    Mike 777 Junior Member

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    Where is that located? I'll just replace it, if it has connection with EGR. Cold weather has impact to some parts, and light comes off.
     
    #13 Mike 777, Mar 25, 2016
  14. m.wynn

    m.wynn Senior Member

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    It's on the intake manifold right next to the throttle body. Pull the air box and you should be able to get at it. Held on by a single bolt, I believe.
     
    #14 m.wynn, Mar 26, 2016
  15. Mike 777

    Mike 777 Junior Member

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    Does MAP has connection to EGR? because if error P0401 identify as an EGR problem
     
    #15 Mike 777, Mar 26, 2016
  16. jdcollins5

    jdcollins5 Senior Member

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    The DTC for P0401 lists the MAP as a possible cause.
     
    #16 jdcollins5, Mar 26, 2016
  17. Mike 777

    Mike 777 Junior Member

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    I went to dealership, asked MAP sensor, they said there is NO on Toyota Prius MAP, it has just MAF sensor.
    Is your car Toyota Prius evropean or usa?
     
    #17 Mike 777, Mar 26, 2016
  18. jdcollins5

    jdcollins5 Senior Member

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    US. You need to find another dealer. You can monitor MAP with SGII, Torque, Engine Link, Tecstream, etc so it does exist.
     
    #18 jdcollins5, Mar 26, 2016
  19. m.wynn

    m.wynn Senior Member

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    There is very much a MAP (manifold absolute pressure) sensor in the U.S. gen 3 Prius. It is where I describe and I've had mine in my hands and cleaned it with MAF cleaner while completing an intake manifold, EGR port de-sludging. Whether or not it has anything to do with P0401 is another matter altogether.

    https://techinfo.toyota.com/t3Portal/document/rm/RM1290U/xhtml/RM0000040YG000X.html?sisuffix=ff&locale=en&siid=1459037083094#RM0000040YG000X

    Your dealer probably only shows it as sensor assy, vacuum (for EFI) part #8942147010

    2010 Toyota Prius Base 1.8L ELECTRIC/GAS Automatic CVT. #8942147010: Manifold Absolute Pressure Sensor
     
    #19 m.wynn, Mar 26, 2016
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  20. Rebound

    Rebound Senior Member

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    It's already been said, but there's a specific Toyota cleaner for the MAP sensor. Luckily, the MAP sensor is really easy to get to.
     
    #20 Rebound, Mar 26, 2016
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