P0420 diag

mycatsareloudB to Mechanic Advice@gearhead.townEnglish · 10 months ago

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

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