HOW DO I KNOW IF MY CRANK POSITION SYNCHRONIZER IS BAD ON MY 2002 F150 BECAUSE ITS NOT IDLING CORRECTLY.

  • Tiny
  • fpierce
  • 2002 Ford F-150
  • 140,000 miles

The engine light is on and the code came back with an 02 sensor I replaced it, didn't work. The reason why I think this is the issue is because a friend of mine was having the same issue with his truck and his mechanic replaced it. My friends truck runs fine now, so before I replace it I would like to know how to test it. It looks to be a pain to do. Thank you

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Saturday, February 4th, 2012 AT 1:16 PM

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  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

What is the exact trouble code you are getting?
After replacement of the O2 sensor, is the trouble code the same?
Did you check the O2 sensor circuit?

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Saturday, February 4th, 2012 AT 2:42 PM
  • Tiny
  • fpierce
  • Member

Ok I went to get the codes read here's what I got p1131 p1151 p0171 and p0174

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Saturday, February 4th, 2012 AT 5:18 PM
  • Tiny
  • mhpautos
  • Expert
  • 30,561 posts

P1131 O2 sensor not heating.
P1151 same as above
P0171 & P0174 lean mixture.

With all these codes I would be checking the air flow meter first.

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Sunday, February 5th, 2012 AT 12:56 AM
  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

Did you test the O2 sensor circuit? When a sensor is replaced and it is not responding, it could be a open circuit instead of a faulty sensor.

Mhpautos is corrct about the MAF being a possible cause.

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Sunday, February 5th, 2012 AT 5:36 AM

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