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3.4 and with in 2 months the cat coverter was replaced twice. Then the o2 sen replaced then things fine for day then engine light was back on. took car back in the tested and keeps bringing back to cat converter. So what else can I be looking to check?
 

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This car has two O2 Sensors, were both replaced? Also was a OEM type cat used or just a simple, cheap aftermarket? Many places will put in a aftermarket unit that is smaller than the OEM design, which will not last as long or work as well.

Which code specifically came up on the last reading?
 
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