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-   -   How many O2 sensors in an 03 5.7? (http://www.ramforumz.com/showthread.php?t=131717)

white12RAM 01-24-2013 03:25 PM

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?

RamTech 01-24-2013 03:36 PM

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.

white12RAM 01-24-2013 04:56 PM

Where do Canadian trucks fit it ?

RamTech 01-24-2013 05:11 PM

They should fall under federal.

HemiLonestar 01-25-2013 09:23 AM

Mine only has 2, pre-cat & post-cat.


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