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Discussion Starter · #1 · (Edited)
Hi guys, found an O2 sensor, just before the cat converter but cannot find the other one anywhere. Looked all along the exhaust but nothing! It is honestly driving me insane, looking endlessly through the net to find a picture or an answer. My previa is 1999 but had the engine replaced with a reconditioned one. Is it possible that maybe it has only one sensor? Or is it under the driver seat? Please help me
 

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On most US models the primary O2 sensor is in front of the catalytic converter and the sesondary one is behind the cc.

My understanding is that the primary sensor would affect the engine's performance the most.
 
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