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-   -   Which o2 sensor is #1 and #2? (http://www.wranglerforum.com/f210/which-o2-sensor-is-1-and-2-a-60466.html)

danbooth 09-02-2010 06:47 PM

Which o2 sensor is #1 and #2?
 
I have a check engine light code of P0135. "Upstream o2 sensor heating element circuit malfunction". It looks like I have 2 sensors upstream (directly underneath the manifold). How do I know which upstream to change and how do I determine #1 and #2 which I have seen mentioned in searching other threads? Is the #1 forward and the #2 aft?

Vehicle 2003 4.0L Wrangler


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