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I took my car to the mechanic ago 2 weeks because it was overheating to the point of being undrivable and not knowing the cause, turned out to be thermostat problem. Today, my check engine light came on, i connected to the obd and codes p0118 (Engine coolant temp), p1491 (Manufacturer control AUX emissions control), p0420 (Catalyst efficiency below threshold (bank 1)) came up, any idea on the fix to these problems?

thank you.
 
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