post #1 of Old 10-29-2013, 10:08 AM Thread Starter
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2002 KJ Liberty 
Join Date: Apr 2013
Location: Fargo
Posts: 415
Code 0153 o2 sensor, is this the left side upstream or downstream sensor?

I believe it's the driver's side back one but don't know which is upstream or downstream. Apparently I need to know for ordering the part.

Jeepguy4276 is offline  
post #2 of Old 10-29-2013, 10:24 AM
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2004 KJ Liberty 
Join Date: Aug 2008
Location: Central OH/ Kilimanjaro,Tanzania
Posts: 5,532
upstream is before the converter ( nearest the engine ) , downstream is after and down by the transmission ( crossmember area)

04 KJ 4.5 JBA lift, 03 KJ 2.5 JBA coilovers,
tommudd is offline  

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