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Discussion Starter · #1 ·
Thought I would share this knowledge as there are many conflicting suggestions on this site.

P1135 & P0125 Point to failed Upstream O2 Sensor on 4.1 Rav with Calif Emissions.

"California Emissions" "Air-Fuel" Sensor seems to be just a Wide Band Oxygen Sensor.
 

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Discussion Starter · #2 ·
I got a used WB O2 upstream sensor from a 2003 Subaru Outback 3L H6 (it comes with two...V6 I guess).

The leads are longer but they plug and play for Gen 1 Rav4 with Calif Emissions.
 
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