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Q: Check engine light came on. Diagnostic code P0420. Failed emissions. on 2005 Acura RSX

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Is this a sensor or does the cat. converter need to be replaced altogether? Check engine light came on, code P0420, failed emissions inspection.
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In most cases when code p0420 sets the catalytic converter requires replacement. Please use the RepairPal estimator to find out what the cost should be. Here is a link - https://repairpal.com/estimator?car_type_id=4292
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