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Thread: Code P0451 EVAP

  1. #1
    Registered Member

    Mazda 5 Sport 2012

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    Feb 2019
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    Code P0451 EVAP

    my CEL came on the other day and the code I am getting is P0451 - EVAP System Pressure Sensor/ Switch Circuit Range/ Performance. I have notice it is burning more gas. When I look up this code most peoples solution is to replace the Tank Pressure Sensor TPS but from what I can see is that the 2012 Mazda5 does not have one. Do you think it might be the front or the back Canister Purge Valves parts LF82-18-740 or LF3T-18-741? Has anyone else had this problem? Here are some readings from my OBD2 reader.Screenshot_20190206-223046_BlueDriver.jpgScreenshot_20190206-225233_BlueDriver.jpgScreenshot_20190206-225245_BlueDriver.jpg

  2. #2
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    Mazda 5 Sport 2012

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    Looking again today I think I my have found the sensor part CG36-42-580A. But still has anyone else had this problem?

  3. #3
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    2009 Mazda 5 GT

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    It could also be the purge valve solenoid, pretty sure it's located under the hood no drvr side of engine. No personal experience but there is a specific method of testing it out that involves blowing through it to see if it's clogged or not.

    Would be easier to rule that out than to drop the tank and replace the sensor only to find out your problem was the purge valve.

  4. #4
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    Part CG36-42-580A

    Iam having the same issue this part CG36-42-580A

    Help solve your problem. What is the name of the problem.

  5. #5
    Registered Member

    Mazda 5 Sport 2012

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    Quote Originally Posted by thelmasaryon@gm View Post
    Iam having the same issue this part CG36-42-580A

    Help solve your problem. What is the name of the problem.
    Yes that part and one more. Here is the link to the service bulletin about it.

    https://m.autoserviceprofessional.co...hats-the-angle

  6. #6
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    2012 Mazda 5

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    Bobby,
    I wonder why they call for a replacement of the cable? Seems odd.

  7. #7
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    Mazda 5 Sport 2012

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    Quote Originally Posted by dougsey View Post
    Bobby,
    I wonder why they call for a replacement of the cable? Seems odd.
    That is because the problem was the position of the sensor so I get to keep the cable tight they had to adjust it.

  8. #8
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    2012 Mazda 5

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    Sep 2014
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    ok, sounds right. I wonder if you could just blast out that sensor with carb cleaner?

  9. #9
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    Mazda 5 Sport 2012

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    Quote Originally Posted by dougsey View Post
    ok, sounds right. I wonder if you could just blast out that sensor with carb cleaner?
    Possibly
    The hose and sensor came as one piece so I didn't look to see if the sensor could be removed by itself with out damaging it. The hose has one time snap lock on all the ends so once it's off it has to be replaced.

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