Having problems with your 2001 Hyundai Sonata ?

How about when u have 2 catalytic converters in the same bank 1.?

\015 How about when u have 2 catalytic converters in the same bank 1' and ur code shows p0421 wich catalytic converter do i need to replace?.\015\012the one close to the manifold or the one underneith the car?\015 Posted / edited by AnonymousUser on : 01-06-2020

Answers :

If you have more than 60K miles start by replacing the Oxygen sensor(s) that is(are) installed after the catalytic converter(s). \015\012\015\012\015\012
\015\012P0421: Warm up catalyst efficiency below threshold. This code means that the computer is detecting the catalyst not warming up to full function quickly enough based on information from the post cat O2 sensor. 
\015\012Good luck and hope this helps. 
Repair Help & Product Troubleshooting for 2001 Hyundai Sonata

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