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    4. what does codes po411,po401,po171 and po174 mean on a 1996 ford F-150 6 cyl
    what does codes po411,po401,po171 and po174 mean on a 1996 ford F-150 6 cyl

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    0  Views: 589 Answers: 1 Posted: 13 years ago
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      po411 lose or broken vacuum line. 


      po401 check  EGR valve vacumm hose 


      po171  the Mass Airflow sensor may need cleaning due to an air filter having not been properly seated and allowing debris to get past the filter. 


      In a nutshell, check all airlines. 

      13 years ago. Rating: 2
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