1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage

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Old

Mar 1, 2011 | 08:58 PM

#1

F250-76

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p0171 & p0174

2001 F150 with a 5.4. The check engine light just came on the other day and its still running fine. Had it scanned at autozone and of course all they said was O2 sensor. Cant imagine they would both go out at the same time. Any suggestions on where to start.
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Old

Mar 1, 2011 | 09:03 PM

#2

70f100longbed

Fleet Mechanic

Joined: Aug 2002

Posts: 1,899

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From: Raleigh USA

You prob have a hole in the PCV tube at the back of the intake. Feel all the rubber elbows and see if any are bad.

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Old

Mar 1, 2011 | 09:08 PM

#3

Ultramagdan

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Joined: Feb 2000

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From: Kansas

70f100longbed has this covered. The only thing I would add is to have asked what code was read? You want a 4 digit number for each code.

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