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catalytic converter options!


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front is 3 pin rear is 4 pin square ( on a 2.2)

 

this is correct. however, the o2 sensors are the same front and rear, they both have 3 wires. just the connectors are different. go figure!!!!

 

in others years, 00 - 04 this may not be accurate.

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well, hopefully, it will. My car has 168k on it, but the engine only has 30k on it...I want it to run as long as it can.

 

Thanks guys. I think either Denso or Bosch will do the job.

 

Thanks again for all the comments.

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  • 4 weeks later...

is this a common subaru specific thing? Because I work on GMs all day and if you get a P0420 only its 99.99999999% of the time a bad converter. We don't even waste time trying to diagnose it, we just replace the converter. If you have a bad o2 sensor you should be getting some codes in the range of p0130-p0139.

It helps to have a proper scan tool. If your #1 o2 sensor is switching voltage properly in closed loop the #2 sensor should show a steady reading and not fluctuate like #1. When #2 is doing the same thing as #1 you have a bad cat.

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^ po102 is almost always o2 in subarus, especially with aftermarket cats and or headers
you mean p0420? p0102 is for MAF.

 

i could understand saying the o2 sensor causing a 420 if you have aftermarket parts, but thats probably bc the sensor is doing its job by reporting low catalyst effeciency. Thats not to say that on a stock system with a 420 its automatically a bad sensor.

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