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Hyundai Santa Fe Code P0421?

code hyundai p0421 santa fe
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Hyundai Santa Fe Code P0421?

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I’ve been having trouble with code P0421… I replaced the catalytic converter and it went away. Two days later the check engine light came back on so I went back to the mechanic and he cleared the code… then 3 days later the check engine light came back on again. I don’t know whats going on… could it be that the oxygen sensors are faulty? Also when I come to a stop at a red light somewhere… sometimes the car feels like it jumps… it doesn’t move forward but it just feels like some sort of bump. It runs fine but the only problem that comes up is code P0421… anyone have any suggestions? Thanks. A: Freeze frame is diagnostic data for the moment the code sets not a problem in this case. II f you have any sort of an exhaust leak it can set this code, because it dilutes the exhaust gas tricking the sensors. So I would remedy any leaks first. Then i would graph pre and post o2s to find faults. Take it to a dealer they have all equipment for this.

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