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Discussion Starter #1
Hi there,

I am looking for a replacement for my rear O2 sensor in my 2003 WRX 5-Speed. I can find a lot of info on the front, but not too much about the rear. I believe I have narrowed it down to these:

Front Sensor

Rear Sensor

Are these the wrong parts? My rex is throwing a P0420. And I'm hoping this is a good place to start to clear this code. Any help is appreciated. Thanks.
 

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10,943 Posts
That sensor isn't even needed. Personally, I'd just find someone with a Tactrix cable and defeat the code through the ECU.
 
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