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my 2009 Saturn vue XR 2wd 3.6 L started showing check engine light a few days ago. I took it to autozone to read code in showed p0454 which is related to emissions system pressure sensor. I need to know if the evaporative emission control system (evap) pressure sensor is the same as the fuel tank pressure sensor? My code is showing intermittent leak


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p0454 is for fuel tank pressure sensor intermittent. you are correct. what engine do you have?


   
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All I know is that it is the 3.6 L engine


   
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the computer turns on the service engine light the second consecutive ignition cycle that the fail occurs. the computer runs an engine-off natural vacuum test and sees a big FTP signal change. ie. a change of 1 inch of h2o in one second. you need to hook up a scanner and look at the ftp sensor under vacuum conditions. see if you can graph the ftp signal under the purge/seal function to view data while commanding purge to 30%. Look for erratic sensor signal. (make sure the sensor port is clear)


   
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ok thanks. I just ordered the new sensor and me and my dad are going to just replace it and see if that fixes the problem. Thanks so much for your advice


   
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