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Ok I have a 2000 mitsubishi montero sport with a CEL. The OBDII reader reads P0403 exhaust gas recirculation circuit malfunction. What does this mean? Is it the O2 sensors that are bad or the cat? What needs to be done to fix the CEL?

I wrote this up here because you guys help me before with my accent's CEL. Ok please let me know and thank you ahead of time.
 

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