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Discussion Starter #1
Is this the o2 sensor before the first cat or after the second cat?
 

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Discussion Starter #3
So the one towards the muffler......not the motor. Thanks!!!!
 

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It could be 1st sensor, 2nd sensor, or cats. Probably the cats.

That is the engine code from HELL! :mad::mad::mad::mad::mad:
 

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Discussion Starter #5
Great!!!!!! ordering o2 sensor from Rockauto. Hope it works
 

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Why are you buying a sensor when the problem is most likely the cat. Swap the sensors, except for lead length they are the same. If you get the same code then the cat is bad.

BTW depending on year, O2 sensors are easy to bench test the early ones anyway. The later models would need a power source of some kind. All it takes is a common propane torch and a Digital Multimeter both of which you probably already have.

Great!!!!!! ordering o2 sensor from Rockauto. Hope it works
 

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Discussion Starter #7
So....more than likely the rear cat?
 

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2 cats. CA emissions. Same as mine. Go whack the cat itself. You can here the thing rattling inside if it is shot.

Front O2 is different than the rear. A/F sensor(more $ of course), 2 cats and then the regular O2.

Denso only for those. I have the URD simulator for my P0420. Though Dick may argue that it's a bandaid fix.

Toyota cats are big money, so I will just get a magnaflow and 86 the second cat.
 

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Discussion Starter #9
Found both cats at rockauto for about 350.
 

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I meant Toyota brand cats. Check some threads about longetivity of the aftermarket ones. There are a few negative opinions.

I have never tried any. Let us know how it works out.
 
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