Need HELP with o2 sensor wiring to ECU
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1999 Toyota Rav 4 - oxygen sensor wiring
O2 sensor connections swapped what happens when upstream for down
o2 sensor not reporting voltage from ECU
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Ecu wire connect to O2 sensor
![](https://ls1tech.com/forums/attachments/conversions-swaps/595053d1501256383-o2-sensor-wiring-case-20ground.png)
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![](http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/08/be/6f/medium/0900c1528008be6f.gif)
O2 sensor wiring Mercedes-Benz Forum
![](https://www.yotatech.com/forums/attachments/f199/167109d1501528238-88-o2-sensor-wiring-help-ecupinoutdiagram_zps9c5d3904.jpg)
88 o2 sensor wiring help - YotaTech Forums
![](https://www.rx7club.com/attachments/2nd-generation-specific-1986-1992-17/361894d1254424792-wiring-question-o2-sensor-pin-ecu-wiring-harness-greyten.jpg)
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![](http://www.ff-squad.com/tech/wiring/vx-02wirefix.jpg)
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![](https://tech.mirage-performance.com/images/Airfuel-wiring-5G.jpg)
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