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  #1  
Old 01-24-2013, 02:25 PM
white12RAM white12RAM is offline
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Default How many O2 sensors in an 03 5.7?

Im working on a buddies truck, 03 reg cab 3500 dually, 2wd with a 5.7 and the parts store says this truck should have 4 sensors but I am only finding 1, right before the cat. This thing did have headers put on it, but its still looks like the original 2 going into 1 pipe then its got a Flowmaster cat-back after the cat so Im not sure where all these 02's would be , dont see any connectors that arent connected either. How many should it actually have?
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Old 01-24-2013, 02:36 PM
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Factory setup consists of 1 upstream and 1 downstream sensors for the 2003 federal emissions package. California emissions use 2 upstream and 2 downstream sensors.
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Old 01-24-2013, 03:56 PM
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Where do Canadian trucks fit it ?
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Old 01-24-2013, 04:11 PM
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They should fall under federal.
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Old 01-25-2013, 08:23 AM
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Mine only has 2, pre-cat & post-cat.
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