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

Is this a sensor or does the cat. converter need to be replaced altogether? Check engine light came on, code P0420, failed emissions inspection.

Asked by for the 2005 Acura RSX
1 answer
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 -