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1997 - 2003 Ford F150 General discussion on the Ford 1997 - 2003 F150 truck.

Idle/Sputtering Problem...O2 Sensor, Moisture?

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Old Mar 15, 2011 | 05:04 PM
  #11  
DragonWolf's Avatar
*Ford Truck Girl*
 
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From: WA
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Bank one sensor one and bank two sensor one are upstream O2 sensors and are forward of the cats. B1S1 is passenger side. B2S1 is driver's side. There are two downstream of the cats as well.
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