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What brand are the oxygen sensors and the Cat
Are they Toyota or Denso brand?
In my experience oxygen sensors other than Denso are not good for Toyota's, at all. I've had some really weird things happen with sensors like Bosch.
OK, you can probably get away with an aftermarket Cat, but they don't last nearly as long as the Toyota brand, hence they cost more.
How about brand of O2 sensor? This is critical when dealing with P0420 code.
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