2004 toyota camry 2.4l l4 263k miles

Got the infamous bank 1 p0420 catalytic converter code,

Just wondering how do I differentiate between the actual cat and an oxygen sensor or gas tank cap

Car is running fine but Definitely lower fuel economy

  • RickMN@alien.topB
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    1 year ago

    A P0420 is never an O2 sensor on a Toyota. If the O2 was bad it would set an O2 code, not a P0420.

    Check for an exhaust leak or high fuel trims. If both are ok, then the cat is bad. It’s just that simple.