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I have P0420 engine code. Do you know which sensor I should replace? Or replace the cat?
Vehicle: 2001, Acura EL. 1.7L

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When it comes to a catalytic convertor, you have one 02 sensor in the front this is the engine management sensor, the 02 after the catalytic is the downstream or the catalytic monitor sensor, When it comes to a Acura P0420 it straight forward, its the catalytic convertor. as a rule of thumb the rear or downstream should also be replaced,

 The ECM looks at the 02 sensor and determines if the 02 sensor is failing this prevents false catalytic codes, When the Acura sets a P0420 it just that , a catalytic

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