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On my 99 2.5L, are both upper sensors the same-with the same connector?
I want to have the correct one (firewall side) with the correct connector, before starting the job. I used a Bosch 11315 on the other side and it had the correct connector (square I think) for that side.
 

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The upstream O2 sensors, (pre-cat) are the same sensor, therefore having the same connector.

THe downstream sensors, (Catalyst Monitors) are the same, but different than the upstream. They use the same connectors between the two of them, but different than the O2's.

Clear as mud?
 
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